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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
The Cook Partisan Voting Index, abbreviated PVI or CPVI, is a measurement of how partisan a U.S. congressional district or U.S. state is.[1] This partisanship is indicated as lean towards either the Republican Party or the Democratic Party,[2] compared to the nation as a whole, based on how that district or state voted in the previous two presidential elections.[3][4]
- ^ Paul, Megan; Zhang, Ruya; Liu, Bian; Saadai, Payam; Coakley, Brian A. (2022). "State-level political partisanship strongly correlates with health outcomes for US children". European Journal of Pediatrics. 181: 273–280. doi:10.1007/s00431-021-04203-y. PMID 34272984.
- ^ Cillizza, Chris (April 10, 2017). "A map that shows we really do live in two different Americas". CNN. Retrieved December 15, 2023.
- ^ Cillizza, Chris (March 14, 2018). "The differences between real grassroots and "Astroturf" matter". CNN. Retrieved November 29, 2020.
Which brings me to the Cook Political Report's Partisan Voting Index or PVI. The goal of the PVI is to compare every congressional district to every other congressional district based on how it has performed in each of the last two presidential elections.
- ^ Benen, Steve (February 7, 2017). "There are 119 Republican House members who should be VERY nervous today". MSNBC. Retrieved November 29, 2020.
To get a sense of a congressional district's political leanings, there's a helpful metric called the Partisan Voter Index, or PVI, created 20 years ago by the Cook Political Report.