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Plurality voting is an electoral system in which each voter is allowed to vote for only one candidate, and the candidate who polls more than any other counterpart (a plurality) is elected. In a system based on single-member districts, it may be called first-past-the-post (FPTP), single-choice voting, simple plurality or relative/simple majority. In a system based on multi-member districts, it may be referred to as winner-takes-all or bloc voting.
The system is still used to elect members of a legislative assembly or executive officers in only a handful of countries in the world. It is used in most elections in the United States, the lower house (Lok Sabha) in India, elections to the British House of Commons and English local elections in the United Kingdom, and federal and provincial elections in Canada.
Plurality voting is distinguished from a majoritarian electoral system in which a winning candidate must receive an absolute majority of votes: more votes than all other candidates combined. Under plurality voting, the leading candidate, whether he or she has majority of votes, is elected.
Both plurality and majoritarian systems may use single-member or multi-member constituencies. In the latter case, it may be referred to as an exhaustive counting system, and one member is elected at a time and the process repeated until the number of vacancies is filled.
In some, including France and some of the United States including Louisiana and Georgia, a "two-ballot" or "runoff-election" plurality system is used, which may require two rounds of voting. If during the first round, no candidate receives over 50% of the votes, a second round takes place with only the top two candidates in the first round. That ensures that the winner gains a majority of votes in the second round.
Alternatively, all candidates above a certain threshold in the first round may compete in the second round. If there are more than two candidates standing, a plurality vote may decide the result.
In political science, the use of plurality voting with multiple, single-winner constituencies to elect a multi-member body is often referred to as single-member district plurality or SMDP.The combination is also variously referred to as "winner-take-all" to contrast it with proportional representation systems.
The term "winner-take-all" is sometimes also used to refer to elections for multiple winners in a particular constituency using bloc voting, or MMDP. This system at the state-level is used for election of most of the electoral college in US presidential elections.
Plurality voting is used for local and/or national elections in 43 of the 193 countries that are members of the United Nations. It is particularly prevalent in the United Kingdom, the United States, Canada and India.
In single-winner plurality voting, each voter is allowed to vote for only one candidate, and the winner of the election is the candidate who represents a plurality of voters or, in other words, received the largest number of votes. That makes plurality voting among the simplest of all electoral systems for voters and vote counting officials. (However, the drawing of district boundary lines can be very contentious in the plurality system.)
In an election for a legislative body with single-member seats, each voter in a geographically-defined electoral district may vote for one candidate from a list of the candidates who are competing to represent that district. Under the plurality system, the winner of the election then becomes the representative of the entire electoral district and serves with representatives of other electoral districts.
In an election for a single seat, such as for president in a presidential system, the same style of ballot is used, and the winner is whichever candidate receives the largest number of votes.
In the two-round system, usually the top two candidates in the first ballot progress to the second round, also called the runoff.
In a multiple-member plurality election with n seats available, the winners are the n candidates with the highest numbers of votes. The rules may allow the voter to vote for one candidate, up to n candidates, or some other number.
Generally, plurality ballots can be categorized into two forms. The simplest form is a blank ballot in which the name of a candidate(s) is written in by hand. A more structured ballot will list all the candidates and allow a mark to be made next to the name of a single candidate (or more than one, in some cases); however, a structured ballot can also include space for a write-in candidate.
The United Kingdom, like the United States and Canada, uses single-member districts as the base for national elections. Each electoral district (constituency) chooses one member of parliament, the candidate who gets the most votes, whether or not they get at least 50% of the votes cast ("first past the post"). In 1992, for example, a Liberal Democrat in Scotland won a seat with just 26% of the votes. The system of single-member districts with plurality winners tends to produce two large political parties. In countries with proportional representation there is not such a great incentive to vote for a large party, which contributes to multi-party systems.
Scotland, Wales and Northern Ireland use the first-past-the-post system for UK general elections but versions of proportional representation for elections to their own assemblies and parliaments. All of the UK has used a form of proportional representation for European Parliament elections.
The countries that inherited the British majoritarian system tend toward two large parties: one left and the other right, such as the U.S. Democrats and Republicans. Canada is an exception, with three major political parties consisting of the New Democratic Party, which is to the left; the Conservative Party, which is to the right; and the Liberal Party, which is slightly off-centre but to the left. A fourth party that no longer has major party status is the separatist Bloc Québécois party, which is territorial and runs only in Quebec. New Zealand once used the British system, which yielded two large parties as well. It also left many New Zealanders unhappy because other viewpoints were ignored, which made the New Zealand Parliament in 1993 adopted a new electoral law modelled on Germany's system of proportional representation (PR) with a partial selection by constituencies. New Zealand soon developed a more complex party system.
After the 2015 Elections in the United Kingdom, there were calls from UKIP for a change to proportional representation after it had received 3,881,129 votes but only 1 MP.The Green Party was similarly underrepresented, which contrasted greatly with the SNP, a Scottish separatist party that received only 1,454,436 votes but won 56 seats because of more-concentrated support.
Imagine that Tennessee is having an election on the location of its capital. The population of Tennessee is concentrated around its four major cities, which are spread throughout the state. For this example, suppose that the entire electorate lives in these four cities and that everyone wants to live as near to the capital as possible.
The candidates for the capital are:
The preferences of the voters would be divided like this:
|42% of voters|
(close to Memphis)
|26% of voters|
(close to Nashville)
|15% of voters|
(close to Chattanooga)
|17% of voters|
(close to Knoxville)
If each voter in each city naively selects one city on the ballot (Memphis voters select Memphis, Nashville voters select Nashville, and so on), Memphis will be selected, as it has the most votes (42%). Note that the system does not require that the winner have a majority, only a plurality. Memphis wins because it has the most votes even though 58% of the voters in the example preferred Memphis least. That problem does not arise with the two-round system in which Nashville would have won. (In practice, with FPTP, many voters in Chattanooga and Knoxville are likely to vote tactically for Nashville: see below.)
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To a much greater extent than many other electoral methods, plurality electoral systems encourage tactical voting techniques like "compromising". Voters are under pressure to vote for one of the two candidates most likely to win even if their true preference is neither of them because a vote for any other candidate is unlikely to lead to the preferred candidate being elected, but it will instead reduce support for one of the two major candidates whom the voter might prefer to the other. The minority party will then simply take votes away from one of the major parties, which could change the outcome and gain nothing for the voters. Any other party will typically need to build up its votes and credibility over a series of elections before it is seen as electable.
In the Tennessee example, if all the voters for Chattanooga and Knoxville had instead voted for Nashville, Nashville would have won (with 58% of the vote). That would have only been the third choice for those voters, but voting for their respective first choices (their own cities) actually results in their fourth choice (Memphis) being elected.
The difficulty is sometimes summed up in an extreme form, as "All votes for anyone other than the second place are votes for the winner". That is because by voting for other candidates, voters have denied those votes to the second-place candidate, who could have won had they received them. It is often claimed by United States Democrats that Democrat Al Gore lost the 2000 Presidential Election to Republican George W. Bush because some voters on the left voted for Ralph Nader of the Green Party, who, exit polls indicated, would have preferred Gore at 45% to Bush at 27%, with the rest not voting in Nader's absence.
That thinking is illustrated by elections in Puerto Rico and its three principal voter groups: the Independentistas (pro-independence), the Populares (pro-commonwealth), and the Estadistas (pro-statehood). Historically, there has been a tendency for Independentista voters to elect Popular candidates and policies. The phenomenon is responsible for some Popular victories even though the Estadistas have the most voters on the island. It is so widely recognised that the Puerto Ricans sometimes call the Independentistas who vote for the Populares "melons" in reference to the party colours because the fruit is green on the outside but red on the inside.
Because voters have to predict in advance who the top two candidates will be, that can cause significant perturbation to the system:
Proponents of other single-winner electoral systems argue that their proposals would reduce the need for tactical voting and reduce the spoiler effect. Examples include the commonly used two-round system of runoffs and instant-runoff voting, along with less-tested systems such as approval voting, score voting and Condorcet methods.
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Duverger's law is a theory that constituencies that use first-past-the-post systems will have a two-party system after enough time.
Plurality voting tends to reduce the number of political parties to a greater extent than most other methods do, making it more likely that a single party will hold a majority of legislative seats. (In the United Kingdom, 21 out of 24 general elections since 1922 have produced a single-party majority government.)
Plurality voting's tendency toward fewer parties and more-frequent majorities of one party can also produce government that may not consider as wide a range of perspectives and concerns. It is entirely possible that a voter finds all major parties to have similar views on issues and that a voter does not have a meaningful way of expressing a dissenting opinion through their vote.
As fewer choices are offered to voters, voters may vote for a candidate although they disagree with them because they disagree even more with their opponents. That will make candidates less closely reflect the viewpoints of those who vote for them.
Furthermore, one-party rule is more likely to lead to radical changes in government policy even though the changes are favoured only by a plurality or a bare majority of the voters, but a multi-party system usually requires more consensus to make dramatic changes in policy.
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Wasted votes are those cast for candidates who are virtually sure to lose in a safe seat, and votes cast for winning candidates in excess of the number required for victory. For example, in the UK general election of 2005, 52% of votes were cast for losing candidates and 18% were excess votes, a total of 70% wasted votes. That is perhaps the most fundamental criticism of FPTP since a large majority of votes may play no part in determining the outcome. Alternative electoral systems attempt to ensure that almost all of the votes are effective in influencing the result, which minimises vote wastage.
Because FPTP permits a high level of wasted votes, an election under FPTP is easily gerrymandered unless safeguards are in place. In gerrymandering, a party in power deliberately manipulates constituency boundaries to increase the number of seats that it wins unfairly.
In brief, if a governing party G wishes to reduce the seats that will be won by opposition party O in the next election, it can create a number of constituencies in each of which O has an overwhelming majority of votes. O will win these seats, but many of its voters will waste their votes. Then, the rest of the constituencies are designed to have small majorities for G. Few G votes are wasted, and G will win many seats by small margins. As a result of the gerrymander, O's seats have cost it more votes than G's seats.
The presence of spoilers often gives rise to suspicions that manipulation of the slate has taken place. The spoiler may have received incentives to run. A spoiler may also drop out at the last moment, which induces charges that such an act was intended from the beginning.
The spoiler effect is the effect of vote splitting between candidates or ballot questions with similar ideologies. One spoiler candidate's presence in the election draws votes from a major candidate with similar politics, which causes a strong opponent of both or several to win. Smaller parties can disproportionately change the outcome of an FPTP election by swinging what is called the 50-50% balance of two party systems by creating a faction within one or both ends of the political spectrum, which shifts the winner of the election from an absolute majority outcome to a plurality outcome, which favours the party that had been less favoured. In comparison, electoral systems that use proportional representation have small groups win only their proportional share of representation.
In August 2008, Sir Peter Kenilorea commented on what he perceived as the flaws of a first-past-the-post electoral system in the Solomon Islands:
An... underlying cause of political instability and poor governance, in my opinion, is our electoral system and its related problems. It has been identified by a number of academics and practitioners that the First Past the Post system is such that a Member elected to Parliament is sometimes elected by a small percentage of voters where there are many candidates in a particular constituency. I believe that this system is part of the reason why voters ignore political parties and why candidates try an appeal to voters' material desires and relationships instead of political parties.... Moreover, this system creates a political environment where a Member is elected by a relatively small number of voters with the effect that this Member is then expected to ignore his party's philosophy and instead look after that core base of voters in terms of their material needs. Another relevant factor that I see in relation to the electoral system is the proven fact that it is rather conducive, and thus has not prevented, corrupt elections practices such as ballot buying.— "Realising political stability", Sir Peter Kenilorea, Solomon Star, 30 August 2008
The United Kingdom continues to use the first-past-the-post electoral system for general elections, and for local government elections in England and Wales. Changes to the UK system have been proposed, and alternatives were examined by the Jenkins Commission in the late 1990s. After the formation of a new coalition government in 2010, it was announced as part of the coalition agreement that a referendum would be held on switching to the alternative vote system. However the alternative vote system was rejected 2-1 by British voters in a referendum held on 5 May 2011.
Canada also uses FPTP for national and provincial elections. In May 2005 the Canadian province of British Columbia had a referendum on abolishing single-member district plurality in favour of multi-member districts with the Single Transferable Vote system after the Citizens' Assembly on Electoral Reform made a recommendation for the reform. The referendum obtained 57% of the vote, but failed to meet the 60% requirement for passing. A second referendum was held in May 2009, this time the province's voters defeated the change with 39% voting in favour.
An October 2007 referendum in the Canadian province of Ontario on adopting a Mixed Member Proportional system, also requiring 60% approval, failed with only 36.9% voting in favour. British Columbia again called a referendum on the issue in 2018 which was defeated by 62% voting to keep current system.
Northern Ireland, Scotland, Wales, the Republic of Ireland, Australia and New Zealand are notable examples of countries within the UK, or with previous links to it, that use non-FPTP electoral systems (Northern Ireland, Scotland and Wales use FPTP in United Kingdom general elections, however).
Nations which have undergone democratic reforms since 1990 but have not adopted the FPTP system include South Africa, almost all of the former Eastern bloc nations, Russia, and Afghanistan.
Countries that use plurality voting to elect the lower or only house of their legislature include:
Proportional representation (PR) characterizes electoral systems in which divisions in an electorate are reflected proportionately in the elected body. The concept applies mainly to geographical, and to ideological partitioning of the electorate. For instance at the European parliament each member state has a number of seats that is (roughly) proportional to its population. The same logic prevails when voters vote for parties. If n% of the electorate support a particular political party or set of candidates as their favorite, then roughly n% of seats will be won by that party or those candidates. The essence of such systems is that all votes contribute to the result—not just a plurality, or a bare majority. The most prevalent forms of proportional representation all require the use of multiple-member voting districts, as it is not possible to fill a single seat in a proportional manner. In fact, PR systems that achieve the highest levels of proportionality tend to include districts with large numbers of seats.
The two-round system is a voting method used to elect a single winner, where the voter casts a single vote for their chosen candidate. Despite its name, the two-round system may resolve an election in a single round if one candidate receives enough of the vote, usually a simple majority. If no candidate receives enough of the vote in the first round, then a second round of voting is held with either just the top two candidates or all candidates who received a certain proportion of the votes.
The single transferable vote (STV) is a voting system designed to achieve or closely approach proportional representation through the use of multiple-member constituencies and each voter casting a single ballot on which candidates are ranked. The preferential (ranked) balloting allows transfer of votes to produce proportionality, to form consensus behind select candidates and to avoid the waste of votes prevalent under other voting systems.
In political science, Duverger's law holds that single-ballot plurality-rule elections structured within single-member districts tend to favor a two-party system.
[T]he simple-majority single-ballot system favours the two-party system.
Single non-transferable vote or SNTV is an electoral system used in multi-member constituency elections. It is a generalization of first-past-the-post, applied to multi-member constituencies.
The additional member system (AMS), also known as mixed-member proportional representation (MMP) outside the United Kingdom, is a mixed electoral system with one tier of single-member district representatives, and another tier of ‘additional members’ elected to make the overall election results more proportional.
Mixed-member proportional representation is a mixed electoral system in which voters get two votes: one to decide the representative for their single-seat constituency, and one for a political party. Seats in the legislature are filled firstly by the successful constituency candidates, and secondly, by party candidates based on the percentage of nationwide or region-wide votes that each party received. The constituency representatives are elected using first-past-the-post voting (FPTP) or another plurality/majoritarian system. The nationwide or region-wide party representatives are, in most jurisdictions, drawn from published party lists, similar to party-list proportional representation. To gain a nationwide representative, parties may be required to achieve a minimum number of constituency candidates, a minimum percentage of the nationwide party vote, or both.
In a first-past-the-post electoral system, voters cast their vote for a candidate of their choice, and the candidate who receives the most votes wins. FPTP is a plurality voting method, and is primarily used in systems that use single-member electoral divisions. FPTP is used as the primary form of allocating seats for legislative elections in about a third of the world's countries, mostly in the English-speaking world.
Parallel voting describes a mixed electoral system where voters in effect participate in two separate elections for a single chamber using different systems, and where the results in one election have little or no impact on the results of the other.
In electoral systems, a wasted vote is any vote which is not for an elected candidate or, more broadly, a vote that does not help to elect a candidate. The narrower meaning includes only those votes which are for a losing candidate or party. The broader definition of wasted votes includes votes for winning candidates in excess of the minimum needed to win.
BC-STV is the proposed voting system recommended by the Citizens' Assembly on Electoral Reform in October 2004 for use in British Columbia, and belongs to the single transferable vote family of voting systems. BC-STV was supported by a majority of the voters in a referendum held in 2005 but the government had legislated that it would not be bound by any vote lower than 60 percent in favour. Because of the strong majority support for BC-STV, the government elected to stage a second referendum in 2009, but with increased public funding for information campaigns to better inform the electorate about the differences between the existing and proposed systems. The leadership of both the "yes" side and the "no" side were assigned by the government. The proposal was rejected with 60.9 percent voting against, vs. 39.1 percent in favour, in the 2009 vote.
Historically, the single transferable vote (STV) electoral system has seen a series of relatively modest periods of usage and disusage throughout the world; however, today it is seeing increasing popularity and proposed implementation as a method of electoral reform. STV has been used in many different local, regional and national electoral systems, as well as in various other types of bodies, around the world.
The supplementary vote (SV) is an electoral system used to elect a single winner, in which the voter ranks the candidates in order of preference. In an election, if no candidate receives an absolute majority of first preference votes, then all but the two leading candidates are eliminated and there is a second count. In the second count, the votes of those who supported eliminated candidates are distributed among the two remaining candidates, so that one candidate achieves an absolute majority.
Multiple non-transferable vote (MNTV), also known as plurality-at-large voting or block vote, is a non-proportional voting system for electing several representatives from a single multi-member electoral district using a series of check boxes and tallying votes similar to a plurality election. Multiple winners are elected simultaneously to serve the district. Block voting is not a system for obtaining proportional representation; instead the usual result is that where the candidates divide into definitive parties the most popular party in the district sees its full slate of candidates elected, resulting in a landslide.
Instant-runoff voting (IRV), also sometimes referred to as the alternative vote (AV), preferential voting, or ranked-choice voting (RCV), though these names are also used for other systems, is a type of ranked preferential voting counting method used in single-seat elections with more than two candidates. Instead of indicating support for only one candidate, voters in IRV elections can rank the candidates in order of preference. Ballots are initially counted for each voter's top choice. If a candidate has more than half of the vote based on first-choices, that candidate wins. If not, then the candidate with the fewest votes is eliminated. The voters who selected the defeated candidate as a first choice then have their votes added to the totals of their next choice. This process continues until a candidate has more than half of the votes. When the field is reduced to two, it has become an "instant runoff" that allows a comparison of the top two candidates head-to-head. Compared to plurality voting, IRV can reduce the effect of vote-splitting when multiple candidates earn support from like-minded voters.
Electoral reform is change in electoral systems to improve how public desires are expressed in election results. That can include reforms of:
An electoral system or voting system is a set of rules that determine how elections and referendums are conducted and how their results are determined. Political electoral systems are organized by governments, while non-political elections may take place in business, non-profit organisations and informal organisations. These rules govern all aspects of the voting process: when elections occur, who is allowed to vote, who can stand as a candidate, how ballots are marked and cast, how the ballots are counted, how votes translate into the election outcome, limits on campaign spending, and other factors that can affect the result. Political electoral systems are defined by constitutions and electoral laws, are typically conducted by election commissions, and can use multiple types of elections for different offices.
Dual-member proportional representation (DMP), also known as dual-member mixed proportional, is an electoral system designed to produce proportional election results across a region by electing two representatives in each of the region’s districts. The first seat in every district is awarded to the candidate who receives the most votes, similar to first-past-the-post voting (FPTP). The second seat is awarded to one of the remaining district candidates so that proportionality is achieved across the region, using a calculation that aims to award parties their seats in the districts where they had their strongest performances.
A mixed electoral system is an electoral system that combines a plurality/majoritarian voting system with an element of proportional representation (PR). The plurality/majoritarian component is usually first-past-the-post voting (FPTP), whereas the proportional component is most often based on party list PR. A distinguishing characteristic of mixed systems is the fact that every voter can influence both the plurality/majoritarian and PR aspects of an election. In a hybrid system, by contrast, different electoral formulas are used in different regions of a country.
The Italian Electoral law of 2017, colloquially known by the nickname Rosatellum bis or simply Rosatellum, after Ettore Rosato, the Democratic leader in the Chamber of Deputies who first proposed the new law, is a parallel voting system, which act as a mixed system, with 37% of seats allocated using a first past the post electoral system and 61% using a proportional method, with one round of voting. The Senate and the Chamber of Deputies did not differ in the way they allocated the proportional seats, both using the largest remainder method of allocating seats.
The fatal flaws of Plurality (first-past-the-post) electoral systems - Proportional Representation Society of Australia