More than 18.6 million Americans in 32 states already have cast ballots in the nation's midterm elections.
That's according to data that state election officials provided to the Associated Press.
Among these ballots, Republicans maintain a lead in Colorado, where they're looking to oust Sen. Mark Udall as part of their drive to reclaiming a Senate majority.
Democrats have a big lead in North Carolina, where Sen. Kay Hagan is in a tight re-election race.
The advance ballots aren't always an indicator of who wins in the end.
Republicans overcame an early voting deficit in North Carolina four years ago to sweep Election Day.
In Colorado, Democratic Sen. Michael Bennet overcame a deficit to win his seat.
Nationwide, at least 11 states have already surpassed their 2010 early voting totals.
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