NBC and CNN were first to declare Barack Obama the winner, I think. The LA Times sent out its tweet calling the race for Obama a few minutes later. At 8:30, it's pretty much a sweep of the major media, including Fox News.
Mayor Antonio Villaraigosa, in Chicago, on Twitter: "The votes are counted. The people have spoken. We’re moving America #Forward. Excited to work w @BarackObama in his 2nd term. Congrats!"