] Using County-by-County election return data from USA
] Today together with County boundary data from the US
] Census' Tiger database we produced the following graphic
] depicting the results. Of course, blue is for the
] democrats, red is for the republicans, and green is for
] all other. Each county's color is a mix of these three
] color components in proportion to the results for that
] county.

I'll also offer two other, well, interesting maps:
http://www.learner.org/biographyofamerica/prog10/maps/
http://house.style.net/usa.jpg

Electoral map by county rather then by state