Nominal Area Choropleth Maps

http://fr.wikipedia.org/wiki/%C3%89lection_pr%C3%A9sidentielle_am%C3%A9ricaine_de_2012

Nominal Area Choropleth map:

• nominal area choropleth maps, are choropleth maps that illustrate categorical data rather than numerical data.
• this map illustrates the political categories for the presidential election. with the categories being the different presidents running.