The 1998 Australian federal election was held to determine the members of the 39th Parliament of Australia. It was held on 3 October 1998. All 148 seats of the House of Representatives and 40 seats of the 76 seat Senate were up for election. The incumbent centre-right Liberal/National Coalition government led by Prime Minister John Howard of the Liberal Party and coalition partner Tim Fischer of the National Party defeated the centre-left Australian Labor Party opposition led by Opposition Leader Kim Beazley, despite losing the nationwide popular and two-party preferred vote. However, the Australian Labor Party gained seats compared to the previous election.
The 2004 Australian federal election was held in Australia on 9 October 2004. All 150 seats in the House of Representatives and 40 seats in the 76-member Senate were up for election. The incumbent Liberal Party of Australia led by Prime Minister of Australia John Howard and coalition partner the National Party of Australia led by John Anderson defeated the opposition Australian Labor Party led by Mark Latham.
The state election for the 51st Parliament of South Australia was held in the Australian state of South Australia on 18 March 2006 to elect all members of the South Australian House of Assembly and 11 members of the South Australian Legislative Council. The election was conducted by the independent State Electoral Office.
A general election was held in the Northern Territory, Australia, on 18 June 2005. The centre-left Labor Party, led by Chief Minister Clare Martin, won a second term with a landslide victory, winning six of the ten seats held by the opposition Country Liberal Party in the 25-member Northern Territory Legislative Assembly, bringing their total to 19. It was the second largest victory in any Northern Territory election. The only larger majority in the history of the Territory was in the first election, in 1974. In that contest, the CLP won 17 of the 19 seats in the chamber, and faced only two independents as opposition.
The 2007 New South Wales state election was held on Saturday, 24 March 2007. The entire Legislative Assembly and half of the Legislative Council was up for election. The Labor Party led by Morris Iemma won a fourth four-year term against the Liberal-National coalition led by Peter Debnam.
The term swing refers to the extent of change in voter support, typically from one election or opinion poll to another, expressed as a positive or negative percentage point. For the Australian House of Representatives and the lower or unicameral houses of the parliaments of all the states and territories except Tasmania and the ACT, as well as Tasmania's upper house, Australia employs preferential voting in single-member constituencies. Under the full-preference instant-runoff voting system, in each seat the candidate with the lowest vote is eliminated and their preferences are distributed, which is repeated until only two candidates remain. While every seat has a two-candidate preferred (TCP) result, seats where the major parties have come first and second are commonly referred to as having a two-party-preferred (TPP) result. The concept of "swing" in Australian elections is not simply a function of the difference between the votes of the two leading candidates, as it is in Britain. To know the majority of any seat, and therefore the swing necessary for it to change hands, it is necessary to know the preferences of all the voters, regardless of their first preference votes. It is not uncommon in Australia for candidates who have comfortable leads on the first count to fail to win the seat, because "preference flows" go against them.
The Mackerras pendulum was devised by the Australian psephologist Malcolm Mackerras as a way of predicting the outcome of an election contested between two major parties in a Westminster style lower house legislature such as the Australian House of Representatives, which is composed of single-member electorates and which uses a preferential voting system such as a Condorcet method or IRV.
In Australian politics, the two-party-preferred vote, commonly referred to as simply preferences, is the result of an election or opinion poll after preferences have been distributed to the two candidates with the highest number of votes who, in some cases, can be independents. For the purposes of TPP, the Liberal/National Coalition is usually considered a single party, with Labor being the other major party. Typically the TPP is expressed as the percentages of votes attracted by each of the two major parties, e.g. "Coalition 50%, Labor 50%", where the values include both primary votes and preferences. The TPP is an indicator of how much swing has been attained/is required to change the result, taking into consideration preferences, which may have a significant effect on the result.
The 2003 New South Wales state election was held on Saturday 22 March 2003. All seats in the Legislative Assembly and half the seats in the Legislative Council were up for election. The Labor Party led by Bob Carr won a third four-year term against the Liberal–National Coalition led by John Brogden.
The Mackerras federal election pendulum, 2006 shows the state of the major political parties ahead of the 2007 Australian federal election. The table shows seats in the Australian House of Representatives arranged in the form of a Mackerras pendulum based on their 2004 federal election two-party preferred result. Some seats in New South Wales and Queensland underwent a redistribution in 2006, their margins have been recalculated due to this.
The following pendulum is known as the Mackerras pendulum, invented by psephologist Malcolm Mackerras. Designed for the outcome of the 2007 federal election, the pendulum works by lining up all of the seats held in Parliament, 83 Labor, 55 Liberal, 10 National, and 2 independent, according to the percentage point margin on a two candidate preferred basis, as elected in 2007. The two candidate result is also known as the swing required for the seat to change hands. Given a uniform swing to the opposition or government parties in an election, the number of seats that change hands can be predicted. Swing is never uniform, but in practice variations of swing among the Australian states usually tend to cancel each other out. Seats are arranged in safeness categories according to the Australian Electoral Commission's classification of safeness. "Safe" seats require a swing of over 10 per cent to change, "fairly safe" seats require a swing of between 6 and 10 per cent, while "marginal" seats require a swing of less than 6 per cent.
General elections were held in the Northern Territory of Australia on 9 August 2008. Of the 25 seats in the Legislative Assembly, 23 were contested; two safe Labor seats were uncontested. The incumbent centre-left Labor Party (ALP), led by Chief Minister Paul Henderson won a narrow third term victory against the opposition centre-right Country Liberal Party (CLP), led by Terry Mills. Labor suffered a massive and unexpected swing against it, to hold a one-seat majority in the new parliament.
The 2011 New South Wales state election held on Saturday, 26 March 2011. The 16-year-incumbent Labor Party government led by Premier Kristina Keneally was defeated in a landslide by the Liberal–National Coalition opposition led by Barry O'Farrell.
A general election was held in the Northern Territory on Saturday 25 August 2012, which elected all 25 members of the Legislative Assembly in the unicameral Northern Territory Parliament.
The following is a pendulum based on the outcome of the 2010 federal election and changes since, including the redistributions of seats in South Australia and Victoria. It is a Mackerras pendulum, invented by psephologist Malcolm Mackerras, which works by lining up all of the seats held in Parliament according to the percentage point margin on a two-candidate-preferred basis. The two-party result is also known as the swing required for the seat to change hands. Given a uniform swing to the opposition or government parties in an election, the number of seats that change hands can be predicted. Swings are never uniform, but in practice variations of swing among the Australian states usually tend to cancel each other out. Seats are arranged in safeness categories according to the Australian Electoral Commission's (AEC) classification of safeness. "Safe" seats require a swing of over 10 per cent to change, "fairly safe" seats require a swing of between 6 and 10 per cent, while "marginal" seats require a swing of less than 6 per cent. The swings for South Australian and Victorian seats are notional, based on calculations by the AEC.
At the 2016 federal election of the 150 House of Representatives seats the Liberal/National Coalition won 76, a one-seat majority, Labor won 69 seats and crossbenchers won the remaining five. A redistribution in 2017/18 changed the representation entitlements. For the next election, the number of seats in the House will increase to 151, South Australia will lose a seat, Victoria and the Australian Capital Territory (ACT) will gain one seat each.
This is a Mackerras pendulum for the 2016 Australian federal election.
The Labor party won the 2018 state election by winning 55 of the 88 lower house seats. The coalition won 27 seats while the Greens and independents won 3 each.
The 2024 Northern Territory general election was held on 24 August 2024 to elect all 25 members of the Legislative Assembly in the unicameral Northern Territory Parliament. Members were elected through full preferential instant-runoff voting in single-member electorates. The election was conducted by the Northern Territory Electoral Commission (NTEC).
The Australian Labor Party won the 2022 federal election, winning 77 of 151 seats in the House of Representatives. The Coalition holds 58 seats, and crossbenchers hold the remaining 16.