This is fascinating:
It's well known that the American sytem of electing a president involves entire states going completely to one candidate or another.
But some scholars at UofM have mapped the election results county-by-county, with the color of the county (red, blue, and shades of purple in-between) indicating the strength of the political leaning, and the size of the county indicating relative population. It is then a more accurate visual mapping of the political leanings of the american populace for presidents.
So in the 2008 Obama-McCain election, the map looks like this:
Note how most of the country is purple. The strongest Democratic centers are on the caosts and major cities.
Compare this to 2004 Bush-Kerry:


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