People celebrate in front of the White House in Washington after television networks announced the reelection of U.S. President Barack Obama.
The Democratic Party faithful watch election-night coverage in Columbus, Ohio.
Obama supporters celebrate in his hometown of Chicago after CNN projected victory for the incumbent president.
Obama supporter Ajay Narayan cheers during a Democratic election-night party at the Mandalay Bay Resort in Las Vegas, Nevada as a TV network announces results.
Mitt Romney supporters react to the election results outside the former Massachusetts governor's presidential-campaign headquarters in Boston.
Romney supporters react to news of Obama's victory at an election-night party in Las Vegas, Nevada.
Keesha Patterson (left) of Ft. Washington, Maryland, proposes marriage to her girlfriend Rowan Ha during an election-night rally at Obama's campaign headquarters in Chicago. Obama has expressed support for the legalization of same-sex marriage.
People watch results roll in at Times Square in New York City.
Obama supporters celebrate in front of the White House in Washington.
Obama supporters celebrate at the Harlem State Office building in New York.
A supporter waits for Republican presidential candidate Mitt Romney to deliver his concession speech in Boston.
Obama supporters celebrate in Chicago, Illinois.
Republican presidential nominee Mitt Romney delivers his concession speech to supporters attending his election-night rally in Boston.
President Barack Obama and First Lady Michelle Obama embrace Vice President Joe Biden and Jill Biden in Chicago moments after the television networks called the election in their favor.
President Barack Obama hugs his daughters, Malia and Sasha, as First Lady Michelle Obama looks on during his election night victory rally in Chicago.
U.S. -- US President Barack Obama and First Lady Michelle Obama acknowledge supporters following Obama's victory speech in Chicago on 07Nov2012
U.S. - Vice President Joe Biden roars as he celebrates U.S. President Barack Obama's election win during Obama's election night rally in Chicago, 07Nov2012
Kenya - Mama Sarah Obama grandmother of US Democratic presidential candidate Barrack Obama, laughs as she receives congratulatory messages at her home in Kogelo, 29Aug2008