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File photo: A stack of vote-by-mail ballots sit on a table prior to being sorted at the San Francisco Department of Elections January 24, 2008 in San Francisco, California.
Early voting has already begun in some states, and across the country, as many as 45 million people could cast their vote well before November 6th.
A lot of people find early voting more convenient, but one of the concerns with it is that you cast your ballot, and then something happens that changes your mind. In a tight race, could uncertainty sway people against it?
A Martinez looks into the psychology behind early voting, who does it, and which party benefits from it.
Chris Mann, professor of political science at the University of Miami