Hillary Clinton appears to be performing strongly in the crucial battleground states of North Carolina and Florida among voters casting ballots before election day.
Data compiled by the Associated Press show the Democratic candidate may also be building an early advantage in Arizona and Colorado.
Donald Trump appears to be holding ground in Ohio, Iowa and Georgia. Those are important states for the Republican nomination, but not sufficient for him to win the presidency if he loses states like Florida or North Carolina.
More than 4.2 million early votes have been cast, far outpacing the rate for this period in 2012.
Balloting is under way in 34 out of 37 early voting states.
In all, more than 45 million people are expected to vote before election day on November 8.