Assuming universal swing in 2012 to a Republican victory of the same margin as Obama's 2008 victory, it does not come out looking as impressive as your map.
I don't know what you used grey to indicate on your map, but the only states with margins within 1 point are NM and OR. Republicans would win 353-185. Even at the margin you describe, Republicans would not win Washington or any New England states besides NH. (Illinois is still voting Democratic by 6 points, though perhaps without Obama as the opponent at this scale of victory it would be approachable).
