Yeah, geopgraphy has NOTHING to do with it, considering NE is ALL BLUE right! I guess you're a socialist Yankee too. Truth hurts.
Theres a different map showing more detail.
Its the sixth one down here: http://www-personal.umich.edu/~mejn/election/2008/
Or more directly here: http://www-personal.umich.edu/~mejn/election/2008/countymappurpler512.png
(I got tired of trying and failing to link the thing.)
It shows a lot of purple to try an indicate areas of the country that may have been red or blue based on the winner, but the win was relatively close.
If or when the trouble comes, I dont think it will turn out to be along regional geographic lines. I think itll be county against county, county against city, neighbor against neighbor. I think itll be nasty.