Both of these maps are examples of a nominal area choropleth map showing Florida voting party trends from 2000. The cartographer was interested in loyalty/disloyalty across party lines. The top map shows that Bush (red) carried more “cross-over” counties than Gore (blue) in this election. According to one paper on this subject, using nominal level data is sometimes considered a less precise level of measuring variables. It seems like many of the political maps use nominal level data for public presentations. Maybe they are trying to make it “blue and red and simple all over” for ease of understanding. Link to website source:
http://www.directionsmag.com/mapgallery/?MapId=124
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