Can McCain win enough electoral votes to claim the Presidency?

According to my calculations, based on state polls by state, McCain only has a chance to win if he can claim NC, PA, OH, and FL. The rest of the nation is a lock, going Democratic or Republican. Even though each state mentioned (NC, PA, OH, and FL) is a "toss up" state, each is leaning slightly Democratic, is this an impossible win for McCain, or, will some backlash Bradley effect win these states for McCain?