Choropleth maps are used to show differing proportions among studied digital recordings by different coloring schemes. This map shows voter turnout as it occurred in the 2004 presidential election. The makers used colors to show percentage of voter turnout while small symbols showed at what age was most common to vote in that state.
http://wpcontent.answers.com/wikipedia/commons/thumb/c/ca/2004US_election_map.svg/280px-2004US_election_map.svg.png
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