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]
^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.