http://www.pollster.com/blogs/interpreting_polls/
A thematic map is a map that displays a physical area, but represents some other type of information, such as social, cultural, economic, etc. This particular map represents the political divisions of the United States in the most recent presidential election. The red states are states whose electoral votes went to John McCain, which the blue states represent states whose votes went to Barrack Obama. This leaves the orange states to represent states who did not declare a clear winner. This map is displayed on the news and internet during and after an election so that people are able to see how the country voted in that election.
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