The 2020 presidential election was historic in many ways. Amid a global pandemic, with unprecedented changes in how Americans voted, voter turnout rose 7 percentage points over 2016, resulting in a total of 66% of U.S. adult citizens casting a ballot in the 2020 election. Joe Biden defeated Donald Trump 306-232 in the Electoral College and had a 4-point margin in the popular vote. While Bidens popular vote differential was an improvement over Hillary Clintons 2016 2-point advantage, it was not as resounding as congressional Democrats 9-point advantage over Republicans in votes cast in the 2018 elections for the U.S. House of Representatives. A new analysis of validated 2020 voters from Pew Research Centers American Trends Panel examines change and continuity in the electorate, both of which contributed to Bidens victory. It looks at how new voters and voters who turned out in one or both previous elections voted in the 2020 presidential election and offers a detailed portrait of the demographic composition and vote choices of the 2020 electorate. It also provides a comparison with findings from our previous studies of the 2016 and 2018 electorates.
A number of factors determined the composition of the 2020 electorate and explain how it delivered Biden a victory. Among those who voted for Clinton and Trump in 2016, similar shares of each about nine-in-ten also turned out in 2020, and the vast majority remained loyal to the same party in the 2020 presidential contest. These voters formed substantial bases of support for both Biden and Trump. Overall, there were shifts in presidential candidate support among some key groups between 2016 and 2020, notably suburban voters and independents. On balance, these shifts helped Biden a little more than Trump.
Chart shows voters who voted in 2018 but not 2016 favored Biden in 2020 Overall, one-in-four 2020 voters (25%) had not voted in 2016. About a quarter of these (6% of all 2020 voters) showed up two years later in 2018 to cast ballots in the highest-turnout midterm election in decades. Those who voted in 2018 but not in 2016 backed Biden over Trump in the 2020 election by about two-to-one (62% to 36%).
Both Trump and Biden were able to bring new voters into the political process in 2020. The 19% of 2020 voters who did not vote in 2016 or 2018 split roughly evenly between the two candidates (49% Biden vs. 47% Trump). However, as with voters overall, there was a substantial age divide within this group. Among those under age 30 who voted in 2020 but not in either of the two previous elections, Biden led 59% to 33%, while Trump won among new or irregular voters ages 30 and older by 55% to 42%. Younger voters also made up an outsize share of these voters: Those under age 30 made up 38% of new or irregular 2020 voters, though they represented just 15% of all 2020 voters.
One somewhat unusual aspect of the 2016 election was the relatively high share of voters (nearly 6%) who voted for one of the third-party candidates (mostly the Libertarian and Green Party nominees), a fact many observers attributed to the relative unpopularity of both major party candidates. By comparison, just 2% of voters chose a third-party candidate in 2020. Overall, third-party 2016 voters who turned out in 2020 voted 53%-36% for Biden over Trump, with 10% opting for a third- party candidate. Among the 5% of Republicans who voted third-party in 2016 and voted in 2020, a majority (70%) supported Trump in 2020, but 18% backed Biden. Among the 5% of Democrats who voted third-party in 2016 and voted in 2020, just 8% supported Trump in 2020 while 85% voted for Biden.
Some of the other key findings from the analysis are here ...