This is a Nominal Area Choropleth Map. This map has two divisions as the colors represent the variations in data. This map depicts the political party selections per state from poor voters. Blue are democrats and red are republicans. These maps depict nominal data meaning data that is quantitative and random.
Found At: http://www.stat.columbia.edu/~cook/movabletype/archives/2007/10/some_cool_graph.html
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