Nov. 4 pivotal vote, where all 435 seats in the House of Representatives and a third of the Senate's 100 seats are at stake, will determine whether Republicans or Democrats control Congress.
US Votes in Crucial Midterm Election

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Voters fill in their ballots as they vote in the U.S. midterm elections at a polling place in Westminster, Colorado, Nov. 4, 2014.

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A woman marks her votes on a ballot at a polling site in Mount Kisco, New York, Nov. 4, 2014. New Yorkers will decide to send back Gov. Andrew Cuomo for a second term.

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Because all the privacy booths are full, Miriam Rodriguez looks over her ballot while leaning against the wall at a polling site in New York, Nov. 4, 2014.

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A voter deposits his ballot in the ballot box for the U.S. midterm elections at a polling place in Westminster, Colorado, Nov. 4, 2014.