No matter how persuasive Donald Trump and Hillary Clinton are at Wednesday night's debate, it's already too late for either to win over millions of voters.
Advance voting by mail or in person is now underway in more than 30 states. At least 2.1 million voters have already cast ballots.
More than 45 million people are expected to vote before Election Day, Nov. 8.
In Nevada, site of the debate, absentee ballots were being mailed out Wednesday.
Early balloting so far has shown promise for Clinton in battlegrounds North Carolina and Florida while Trump has generally held ground in Iowa and Ohio.
Early voting is traditionally favored by Democrats and is a key part of the Clinton campaign's strategy. Trump is counting on a stronger performance on Election Day itself.