Barack Obama is favored in Maryland, Virginia, and DC for the Potomac Primaries tomorrow, and he's certainly riding a wave of momentum. He swept all four states that held primaries this weekend — Maine (59 percent), Louisiana (57 percent), Nebraska (68 percent), and Washington (68 percent). His victory in Maine was the most unexpected, since Hillary Clinton has the endorsement of the state's governor and because of the state's proximity to Massachusetts and New Hampshire, both of which Clinton won. According to CBS, Obama has a very small delegate lead (1,134 to 1,131) over Clinton, who has far more superdelegates on her side than Obama does.

Meanwhile, Hillary Clinton just got a new campaign manager. She says it's unrelated to the weekend's losses.