Between roughly 11:15pm and 11:20pm on Tuesday, November 6th, news outlets including NPR, the BBC, CBS, NBC, FOX, CNN and others have called the 2012 Presidential Election for Barack Obama.
Ohio proved to be a pivotal battleground state as has been predicted over the past few months. Ohio was called for Obama by a very narrow margin when 77% precincts were reporting. As of 11:40pm on Tuesday night, other battleground states including Florida and Virginia have not been called, but Obama currently has a narrow lead in both states as well.
As of 11:40pm on Tuesday night, the Romney campaign has not conceded the State of Ohio or the election.
Edit: As of 1:00am on early Wednesday morning, Romney delivered his concession speech.
More information about election results can be found on the Columbus Underground Messageboard.