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When similar data was presented after the 2000 presidential election, I was amazed that it was not presented in earlier elections. I was glad to see it come back in 2004, because it offers a fascinating view of political tendencies across the nation. This data comes from USA today.

Of particular interest to me is the state of Arizona, which has been a Republican state for a long time. I always wondered how that was possible. When I was living in Flagstaff, most people seemed to be Democrats, or at least a large portion of them were. Here's the answer. As in 2000, the counties that contain Tucson, Nogales and Flagstaff went for the Democrats.
Texas is interesting, too. Almost every county except El Paso, Travis, Jefferson, Presidio, Newton, and several along the Mexican border voted Republican. Travis County I understand - Austin is a very liberal town. (Almost socialist). I can only think it must the influence of the college there. El Paso, I'm not sure about, perhaps its the influence of unions of the border. Nor does Jefferson and newton counties near the eastern border with Louisiana make any sense to me.
Overall, It's interesting and expected that the big cities near the coasts such as NY, LA, San Francisco, and Seattle went democratic as well as Las Vegas, NV.
Only New England really went for the Democratic candidate Massachusetts, of course, did in its entirety, and so did much of Vermont. But significant parts of that state and New Hampshire voted Republican.
Strangely, most of the counties in New York State voted Republican. It's only the NYC and Long Island counties that went Democrat.
What does this mean? I think it means that city and country folks think differently in general. The city people tend to be affiliated with the Democrats, and the country people tend to side with the Republicans more.
Its interesting to note that many Mississippi river counties voted Democratic while their neighbors further away voted Republican. Why? Perhaps it's the influence of unions and shipping up and down the river?
I'm sure someone out there is studying this for a research paper in political science or something.
Update:
Great site from U of Michigan: (courtesy Mike B.)
http://www-personal.umich.edu/~mejn/election/