http://www.stat.columbia.edu/~cook/movabletype/archives/2007/10/some_cool_graph.html
A choropleth graph measure geographic information. The various colors help to easily distinguish the comparisons of the various locations. The qualitative comparison of the nation in this map represents a simple conclusion (when compared to the other 3 maps on the website) that the richer members of the population tends to vote more republican.
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