(To be updated throughout the night)
In Virginia, things are still close. In Prince Edward County, Obama is performing at about the level he did in 2008. In many other counties, though, Romney seems to be exceeding McCain's margins by a point or two.
CNN has now called Michigan for Obama.
UPDATE: Scott Brown concedes to Elizabeth Warren.
And George Allen has conceded in Virginia.
UPDATE 11pm: North Carolina called for Romney.
Colorado, Ohio, Virginia, and Florida all seem to be crucial steps on Romney's path to the presidency at the moment.
UPDATE after midnight: Most of the networks have now called the national race for President Obama.
UPDATE 12:53am: Romney concedes.