Five U.S. networks—CNN, ABC, CBS, NBC, and Fox—have all projected that Barack Obama will serve another four years as president of the United States.
His Republican challenger, Mitt Romney, has a slight lead in the popular vote, though the results haven't come in for the most populous state, California, which is expected to go for Obama.
But Obama has at least 274 votes out of the 538 available in the electoral college as a result of taking battleground states Ohio, Wisconsin, Iowa, and Pennsylvania.
The Republicans will continue to control the House of Representatives and the Democrats retain control of the Senate.
Obama is the third consecutive U.S. president to be re-elected, following in the footsteps of Republican George W. Bush and Democrat Bill Clinton.