President Barack Obama has defeated his Republican challenger Mitt Romney to win a second and final term in office.
Obama Wins a Second Term in Office
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Republican presidential candidate Mitt Romney waves to supporters before conceding at his election night rally, November 7, 2012, in Boston, Massachusetts.
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A supporter reacts to voting results displayed on a TV screen during Republican presidential candidate Mitt Romney's election night rally in Boston, Massachusetts, November 7, 2012.
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Republican presidential candidate Mitt Romney and his wife Ann stand on the stage with Republican vice presidential candidate Paul Ryan,and his wife Janna during his election night rally, November 7, 2012, in Boston, Massachusetts.
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Supporters of U.S. President Barack Obama cheer during his election night rally in Chicago, November 6, 2012.