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The '''Cook Report''', whose full name is the '''The Cook Political Report''', is the leading nonpartisan resource on likely election outcomes, redistricting, control of the [[House]] or [[U.S. Senate]], and other future-looking political developments.
 
The '''Cook Report''', whose full name is the '''The Cook Political Report''', is the leading nonpartisan resource on likely election outcomes, redistricting, control of the [[House]] or [[U.S. Senate]], and other future-looking political developments.
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Charlie Cook founded it in 1984 after working as a staffer on [[Capitol Hill]].  
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Charlie Cook founded it in 1984 after working as a staffer on [[Capitol Hill]].
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==Cook Partisan Voting Index==
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The main feature of the Report is the '''Cook Partisan Voting Index (PVI)'''.
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There are actually two PVI's calculated: one for each state, and a separate for each Congressional district.<ref>Although the District of Columbia is not a state nor does it have a Member of Congress, since it participates in Presidential elections due to the 23rd Amendment, a PVI is calculated for it as well.</ref>  The index is expressed as a letter (R for Republican, D for Democrat) followed by a plus sign and a number.  The larger the number, the more likely that a state (or district) tends to vote for a particular political party.
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Any state or district which voted within 0.5 percent of the national average is considered "Even".
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The state calculation is based on the average of a state's voting in the two most recent Presidential elections, then compared to the national popular vote percentages.  Similarly, the district calculation is based on the average of a district's voting in the same Presidential elections used for the state calculations, again compared to national percentages.
    
== Accuracy ==
 
== Accuracy ==
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