Voter segments in political polling

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Voter segments in political polling in the United States consist of all adults, registered voters, and likely voters.

Contents

Definitions

Political opinion polling in the United States usually surveys one of three population segments.

Relative values

According to the American Association for Public Opinion Research, "there is a consensus in the polling community that it is better to report 'likely' voters than 'registered' voters". [2] Reporting on a Pew study, the Washington Post has noted that polls of "likely voters" represent the "Holy Grail of polling" and are most likely to accurately reflect the outcome of an election. [3]

An analysis of 2010 polling by FiveThirtyEight concluded that polls of "registered voters" that year tended to favor Democratic candidates by a factor of five percentage points over the actual results of the election, while polls of "likely voters" tended to favor Republican candidates by a factor of one percentage point over the actual results of the election. [4] According to the Huffington Post this is because registered voters who are least likely to actually cast a ballot tend to be low-income voters, or persons living in urban areas, which are constituencies that tend to favor Democratic candidates. [5] A 2018 study by the Pew Research Center found that registered voters tend to lean more to the Democratic Party than to the Republican Party, stating that "For those individuals identified as registered to vote by state governments, the voter file has a score (ranging from 0 to 100) describing their likelihood of voting for Democrats or Republicans, with higher numbers indicating a preference for Democrats. According to the full voter file, 55% of all registered voters in the U.S. are likely Democrats and 33% are likely Republicans." [6] An October 2019 report from the Pew Research Center found that, among registered voters, "the Democratic advantage in party affiliation is typically about 3 percentage points smaller than it is among the general public in our surveys... registered voters tend to be older, wealthier and more likely to be non-Hispanic whites and homeowners, all of which are characteristics associated with a higher probability of being a Republican." [7] In addition, a 2017 analysis from the Pew Research Center found that "voter-only polls tend to get somewhat more favorable views of a Republican president or candidate and less favorable views of Democrats. This pattern was evident during Barack Obama’s presidency, with his overall ratings tending to be somewhat higher among the general public than among registered or likely voters." [8]

A 2020 report from the Pew Research Center found that in 2018 and 2019, "34% of registered voters identified as independent, compared with 33% who identify as Democrats and 29% who identify as Republicans. The share of registered voters who identify with the Republican Party is up 3 percentage points, from 26% in 2017, while there has been no change in the share who identify as Democrats." The report found wide differences among partisans based on race, gender, and education. The report notes that women are likelier than men to identify with the Democratic Party. The study found that "underlying the gender gap in leaned party identification is a gender difference in voters’ straight party identification: Men are more likely to identify as Republicans (31%) than Democrats (26%), while the reverse is true among women (39% identify as Democrats, 28% as Republicans)." [9] [10]

Methods for identifying "likely voters"

Polls targeting "likely voters" generally begin with a list of known registered voters and then ask respondents a series of screening questions before the survey is conducted. Often this can simply be "are you going to vote on Election Day?" with respondents who answer "yes" to the question being included in the survey's final results, and those who answer "no" being excluded. [11] In other cases, complex formulas that account for a variety of demographic and psychographic variables are applied. [11] Pollsters also ask respondents about their past voting history and their intention to vote on Election Day. [12]

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References

  1. 1 2 3 "What is the difference between registered voters and likely voters?". Gallup. Gallup. 21 May 2010. Retrieved February 6, 2017.
  2. 1 2 3 4 "Likely Voters". American Association for Public Opinion Research. There is a consensus in the polling community that it is better to report "likely" voters than "registered" voters, especially as Election Day approaches.
  3. Clement, Scott (January 6, 2016). "Why the 'likely voter' is the holy grail of polling". Washington Post . Retrieved February 6, 2017.
  4. "Registered Voter Polls Will (Usually) Overrate Democrats". Five Thirty Eight . September 9, 2014. Retrieved February 6, 2017.
  5. "Differences Between Registered And Likely Voter Polls Didn't Affect Fall Trends In 2014 Senate Forecast". Huffington Post . February 6, 2017. Retrieved December 15, 2014.
  6. Kennedy, Courtney; Hatley, Nick; Keeter, Scott; Mercer, Andrew; Igeilnik, Ruth; Traylor, Frederic (October 9, 2018). "The RBS poll comports well with data from the full voter file about the partisanship of registered voters". Pew Research Center . Retrieved October 9, 2018.
  7. Kennedy, Courtney; Keeter, Scott (October 25, 2019). "Why public opinion polls don't include the same number of Republicans and Democrats". Pew Research Center . Retrieved October 26, 2019.
  8. Kennedy, Courtney; Deane, Claudia (February 16, 2017). "A basic question when reading a poll: Does it include or exclude nonvoters?". Pew Research Center . Retrieved November 30, 2019.
  9. "Democratic edge in party identification narrows slightly". Pew Research Center. June 2, 2020. Retrieved June 4, 2020.
  10. Agiesta, Jennifer (June 2, 2020). "Analysis of changing electorate shows a divided and partisan America that could grow even further apart". CNN . Retrieved June 4, 2020.
  11. 1 2 Newport, Frank (23 May 2000). "How Do You Define "Likely Voters"?". Gallup. Gallup . Retrieved June 2, 2019.
  12. Jacobson, Louis (November 27, 2019). "Poll results are about to flood news feeds across the United States. Here's what voters should look for when reading them". Poynter Institute . Retrieved November 30, 2019.