Visual example...
@freemo I'm ignorant about the US in all possible ways, but isn't this one of the many reasons why your map is so red? https://www.theguardian.com/us-news/ng-interactive/2021/nov/12/gerrymander-redistricting-map-republicans-democrats-visual
@mapto no these arent congressional districts, so gerrymandering doesnt effect this map. It is based off the popular lean in counties.