President Barack Obama joins former President Bill Clinton on stage at the Democratic National Convention, Wednesday, Sept. 5, 2012, in Charlotte, N.C.CHARLOTTE, N.C. - Democrats have nominated Barack Obama for a second term as president, setting up a showdown this fall with Republican challenger Mitt Romney.
In a raucous roll call of states that stretched into early Thursday, Ohio put Obama over top, giving him a victory that was a foregone conclusion before the first caucus in January.
Four years ago, Obama prevailed in an epic primary fight against Hillary Rodham Clinton to become the first black presidential candidate to lead his party. This time around, Obama was the only Democrat on the ballot in every state and former President Bill Clinton put Obama's name in nomination.
Democrats are scheduled to nominate Joe Biden for a second term as vice president later Thursday.