A swing vote is a vote that is seen as potentially going to any one of a number of candidates in an election, or, in a two-party system, may go to either of the two dominant political parties. It usually comes from voters who are 'undecided' or who may change their preferences between candidates or parties. Such votes are usually sought after in election campaigns, since they can play a big role in determining the outcome.
A swing voter or floating voter is a voter who may not be affiliated with a particular political party (Independent) or who will vote across party lines. In American politics, many , Liberalism Republicans, and conservatism Democrats are considered "swing voters" since their voting patterns cannot be predicted as easily as voters in 'safe seat' voters.
While the swing voter is ostensibly the target of most political activity during elections, another factor is the success of each party in rallying its core support. In a two-party system, those who become disillusioned with their once-favoured party are more likely to vote for a third-party or abstain than cross over.
Smaller groups that use voting to decide matters, such as chambers of parliament and supreme courts, can also have swing voters. The smaller the group, the more power swing voters can have. For example, on the Supreme Court of the United States, a court of nine judges, one judge may be seen as single-handedly deciding a case when four others are committed to each side.
Whether swing voters actually exist is a point of contention. Prior to an election, some voters may claim to be "swing voters", open to the idea of changing their vote. But in reality, they are not as "undecided" as they may claim. They have pre-existing biases and history that almost always draws them to one political side or the other.
Focusing only on the undecided voters instead of all voters at large is a core part of almost all political campaigns. With this framework in mind, the idea of a swing vote can closely tie with the concept of . Swing/Battleground states are states that neither party can guarantee will go in their favour. These are the states that politicians will most likely focus their time to maximize their reach, in the same way that there is a focus on swing voters. Identifying battleground states is much easier than identifying individual swing votes.
To some extent, it is unclear if a state truly is a "swing state." For decades Missouri was the ultimate "swing" state until 2004 when it "swung" from Democrat to Republican. Since then it has been reliably Republican in presidential elections. The same can be said for the state of Florida which was famously the deciding state in the 2000 presidential election, but in the 2016, 2020 and 2024 presidential elections has become reliably Republican. Colorado and Virginia also went from "swing states" to reliably Democrat in recent presidential elections as well.
With battleground states being essential in a potential close call in a future election, campaigns must balance their efforts, targeting persuadable voters while energizing their base to ensure high turnout. The 1960 election, where swing voters tipped the scales for Kennedy, demonstrates the importance of strategic resource allocation, prioritizing battleground areas where both groups can be influenced. However, swing voters often reinforce existing trends rather than decisively shifting outcomes, showing the need for campaigns to focus on broad appeal through national messaging and policies that resonate across demographics.
They may be dissatisfied party members who are open to the idea of voting for other political party, or they could be officially registered as "independents" or simply people who have never had a strong affiliation with any political party and will vote depending on certain things such as valance factors with may influence them: healthcare, Employee benefit, election campaign, etc.
Some, but not all, swing voters are considered to be "low-information voters." Because the votes of swing voters are considered to be "up for grabs," candidates direct a fair proportion of campaign effort towards them, but they must also be concerned with voter turnout among their political base. There is a perception that swing voters are primarily motivated by Self rather than values or ideology and so are particularly susceptible to pork barreling.
If a constituency contains a large proportion of swing voters it is often called a marginal seat and extensive campaign resources are poured into it.
"Overall, white voters are likely to swing the outcome of a national election by an average of 10 percentage points—voting more Democratic in elections Democrats win and more Republican in elections Republicans win," according to a 2008 report by the Democratic Leadership Council. Most of this (6.7 of the 10 percentage points) is due to those white people who have only a high school education.
In mid-term and presidential elections from 1992 to 2014, people who self-identified as "gay, lesbian, or bisexual" voted consistently "around 75% Democratic within a range of 67 to 81%." In the 2016 presidential election, people who identified as gay, lesbian, bisexual or transgender cast 78% of their votes for the Democratic candidate Hillary Clinton.
Among people who identify as gay and bisexual, men's support for Democratic candidates in the 1990s Congressional elections (held every two years from 1990 to 1998) was more consistent than women's. Across these five elections, men's support ranged from 67% to 75%, while women's support ranged from 53% to 82%. This suggests that lesbian and bisexual women may be more likely swing voters, at least over time, if not necessarily for any given election. There are also differences by state: "California GLB voters are more likely to identify as 'Independent' than are GLB voters nationally, and therefore have a greater potential to play the role of a swing vote in a close election."
In the 2020 election, 30% of voters were considered swing voters. The swing votes in this election demographically were younger, ideologically moderate, disengaged in politics. Political apathy also plays a part in identifying swing voters. 24% of swing voters did not vote in the 2016 election and 22% did not vote in the 2018 election. 18-29 year olds were the age group that had the highest percentage of swing voters - there was about the same number of swing voters as there were "decided voters". In the oldest age group of 65 and older, only 22% are considered swing voters. Another important data point from the 2020 election was that 39% of Swing Voters say they are paying "a lot" of attention to politics, compared to the 68% of decided voters that pay attention.
In the 2024 election, the Donald Trump political victory highlights how new voter groups can emerge that had been nearly unseen before. What now looks like a new group called "Barstool Conservatives" would have been seen prior to the election as "swing voters" given their youth which would imply liberalism but male gender which would imply conservatism. But the continuing relevance of Donald Trump in American politics through the 2024 election, and potentially the future, highlights how a hypothetical "swing voter" can become the base demographic of a candidate almost instantaneously.
In the Supreme Court of the United States the swing justice, if one exists, essentially decides the overall outcome of the ruling during a split, which can mean highly impacting landmark decisions. For example, the effective decision of the President of the United States in the 2000 election was ultimately made by Justice Anthony Kennedy in the Bush v. Gore case.
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