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Cook Partisan Voting Index
Political statistical index / From Wikipedia, the free encyclopedia
The Cook Partisan Voting Index, abbreviated PVI or CPVI, is a measurement of how partisan[1] a United States congressional district or state is. This partisanship[2] is indicated as lean towards either the Republican Party or the Democratic Party, compared to the nation as a whole, based on how that district or state voted in the previous two presidential elections.[3][4]
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Map legend:
State or district has a Cook PVI of D+10 or greater
State or district has a Cook PVI between D+5 and D+10
State or district has a Cook PVI between D+2 and D+5
State or district has a Cook PVI between EVEN and D+2
State or district has a Cook PVI between EVEN and R+2
State or district has a Cook PVI between R+2 and R+5
State or district has a Cook PVI between R+5 and R+10
State or district has a Cook PVI of R+10 or greater