The map has no real meaning
It's just kind of cool. It's a visual equivalent of a statistics trick, since obviously in real life the square miles have nothing to do with the population. If everyone at the U.S. Antarctic Station had voted for Bush, the entire Antarctic Continent would be red. And what would that prove?
However, the map may say something important about the differences in thought patterns between urban Americans and those who still live in small towns and farms.