More than 22 million Americans have already cast ballots in the 2020 election, a record-shattering avalanche of early votes driven by Democratic enthusiasm and a pandemic that has transformed the way the nation votes.
The 22.2 million ballots submitted as of Friday night represents 16 per cent of all votes cast in the 2016 presidential election, even as eight states are not yet reporting their totals and voters still have more than two weeks to cast ballots.
Americans' rush to vote is leading election experts to predict a record 150 million votes may be cast and turn-out rates could be higher than in any presidential election since 1908.
"It's crazy," said Michael McDonald, a University of Florida political scientist who has long tracked voting for his site ElectProject.org. McDonald's analysis shows roughly 10 times as many people have voted compared with this point in 2016.
"We can be certain this will be a high-turn-out election," Mr McDonald said.
So far the turn-out has been lopsided, with Democrats out-voting Republicans by a 2-1 ratio in the 42 states included in The Associated Press count.
Republicans have been bracing themselves for this early Democratic advantage for months, as they have watched President Donald Trump rail against mail-in ballots and raise unfounded worries about fraud.
Polling, and now early voting, suggest the rhetoric has turned his party's rank and file away from a method of voting that, traditionally, they dominated in the weeks before Election Day.
That gives Democrats a tactical advantage in the final stretch of the campaign. In many critical battleground states, Democrats have "banked" a proportion of their voters and can turn their time and money toward harder-to-find infrequent voters.
But it does not necessarily mean Democrats will lead in votes by the time ballots are counted. Both parties anticipate a swell of Republican votes on Election Day that could, in a matter of hours, dramatically shift the dynamic.
"The Republican numbers are going to pick up," said John Couvillon, a GOP pollster who is tracking early voting. "The question is at what velocity, and when?"
Couvillon said Democrats cannot rest on their voting lead, but Republicans are themselves making a big gamble.
A number of factors, from rising virus infections to the weather, can impact in-person turn-out on Election Day.
"If you're putting all your faith into one day of voting, that's really high risk," Couvillon said.
That is why, despite Trump's rhetoric, his campaign and party are encouraging their own voters to cast ballots by mail or early and in-person.
The campaign touts a swell in voter registration in key swing states like Florida and Pennsylvania.
But it has had limited success in selling absentee voting. In key swing states, Republicans remain far less interested in voting by mail.
In Pennsylvania, more than three-quarters of the more than 437,000 ballots sent through the mail so far have been from Democrats.
In Florida, half of all ballots sent through the mail so far have been from Democrats and less than a third of them from Republicans.
In Colorado only 19 per cent of ballots returned have been from Republicans.
Australian Associated Press