Early voting surged. Election Day voting plummeted. The net result: A smaller share of eligible voters cast ballots in 2016 than in either of the previous two presidential elections.
The raw number of votes rose: About 1.4 million more Americans voted in this years election than in 2012, a total which itself was down from 2008. But the electorate was growing in the meantime: About 57 percent of eligible voters cast ballots this year, down from 58.6 percent in 2012 and 61.6 percent in 2008, which was the highest mark in 40 years. Turnout still remained well above levels for most presidential election years from 1972 to 2000.
The drop in turnout was uneven. On average, turnout was unchanged in states that voted for Trump, while it fell by an average of 2.3 percentage points in states that voted for Clinton. Relatedly, turnout was higher in competitive states most of which Trump won. In the 14 swing states those where either the winning party in the presidential race switched from 2012 or where the margin was within 5 percentage points an average of 65.3 percent of eligible voters cast ballots. In the other 36 states and Washington, D.C., turnout averaged just 56.3 percent. That gap exacerbates a tendency for turnout to be higher in the places where candidates concentrate their travel, advertising and other get-out-the-vote efforts.
The low turnout outside of swing states could have affected the national popular vote margin (though not the outcome in the Electoral College). Clinton trails Trump in total votes from swing states but leads him in the other states and overall. Clintons popular-vote lead probably would be roughly 40 percent higher if turnout in uncompetitive states caught up with turnout in the swing states though there could be other factors that make turnout higher in the group of states that are most competitive in presidential races.
These numbers are preliminary estimates subject to change as our decentralized electoral system continues counting votes. There is no official national turnout figure, and the best available estimates from Michael McDonald, associate professor at the University of Florida, who gathers data at the U.S. Elections Project; and from FiveThirtyEight contributor David Wasserman, who is gathering national vote counts suggest that more than 4 million votes remain uncounted, more than half of them in California.
