The United States presidential election of 2012 was the 57th quadrennial presidential election. It was held on Tuesday, November 6, 2012. The Democratic nominee, incumbent President Barack Obama, and his running mate, Vice President Joe Biden, were elected to a second term. Their major challengers were the Republican nominee, former Massachusetts Governor Mitt Romney, and his running mate, Representative Paul Ryan of Wisconsin.
Although most major media outlets insisted before the election that the race was too close to predict a winner in advance, analysts using statistical models, bookmakers, and betting markets had Obama as a clear favorite. At around 11:15 PM EST on Election Day, most major television networks called Ohio for Obama, projecting him the winner of the election. At around 1:00 AM EST on November 7, Romney conceded the election to Obama. By November 10, the electoral outcomes of all 50 states and the District of Columbia had been definitively projected. Obama won 332 electoral votes and carried all the states and districts (among states that allocate electoral votes by district) that he had won in the 2008 election except North Carolina, Indiana, and Nebraska's 2nd congressional district.
Eight states (Arizona, Florida, Georgia, Nevada, South Carolina, Texas, Utah, and Washington) gained votes due to reapportionment based on the 2010 Census. Ten states (Illinois, Iowa, Louisiana, Massachusetts, Michigan, Missouri, New Jersey, New York, Ohio, and Pennsylvania) lost votes.