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Obama supporters cheered during an election night watch party in Chicago, Illinois, as results favouring the incumbent trickled in.
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People at the Romney campaign's election night event in Boston, Massachusetts, react to results displayed on a television screen.
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Mitt Romney spent election day campaigning, here talking to reporters aboard his campaign plane en route to Boston, Massachusetts.
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President Obama called volunteers from a campaign office in Chicago, Illinois, to thank them for their efforts.
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Many voters in New York and New Jersey voted at makeshift polling stations due to disruption from the storm Sandy, that killed dozens and caused widespread destruction.
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People wait in line to vote at the Columbia Heights Educational Campus in Washington, DC.
Denver election worker Constance Rolon waits for voters to deposit their ballots at the Denver Elections Division headquarters.
Donna Kaye Erwin posts the results after the 10 registered voters in the small village of Dixville Notch, New Hampshire, cast the first election day ballots.
Early voters cast their absentee ballots at the Minneapolis City Hall. About 30 million people voted before election day, either by mail or in person.
A poll worker tapes up a sign on a voting machine warning voters of the sensitivity of the touch screen during the US presidential election in Pineville, North Carolina.
Voters wait in line to vote at Harrison United Methodist Church in Pineville, North Carolina.
A voter casts her ballot in Newark,Ohio.
Republican vice presidential candidate Paul Ryan and his wife Janna vote accompanied by their children Charlie, Sam and Liza in Janesville, Wisconsin.
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Raena Lamont, 3, is dressed as the fictional character Captain America at a polling center doubling as a donation site in New York City as the city recovers from Sandy.
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People around the world were awaiting the results. This picture is from an election party in Berlin, Germany.