Obama and McCain in Front after Potomac Primaries

Barack Obama didn't just win yesterday in Maryland, Virginia and the District of Columbia. He won by landslides, and now has more delegates than Hillary Clinton. John McCain won, too, but Mike Huckabee beat him among conservatives and evangelicals. Yesterday's Potomac primaries changed the appearance of both presidential nominating campaigns, as we hear from Byron York of the National Review and Jonathan Weisman of the Washington Post.