Continuously Graded Proportional Circle Map- a map that uses proportional circles to indicate change in magnitude of a factor. The circles come in all sizes to reflect all possible magnitudes of data.
This map shows the amount of voters by state and metropolitan area who voted for Obama or McCain in the 2008 election compared with those who voted for Bush or Kerry in the 2004 election. There are many different circle sizes- they are not limited to just four or five. The circle is proportionate to the number of voters.
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