Political Party Affiliation: 30 States Blue, 4 Red

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Only four states show a sizeable Republican advantage in party identification, the same number as in 2008. That compares to 29 states plus the District of Columbia with sizeable Democratic advantages, also unchanged from last year.

These results are based on interviews with over 160,000 U.S. adults conducted between January and June 2009, including a minimum of 400 interviews for each state (305 in the District of Columbia). Each state's data is weighted to demographic characteristics for that state to ensure it is representative of the state's adult population.

Political Party Affiliation: 30 States Blue, 4 Red in 2009 So Far