What is the best publicly-available data source for the geographic distribution of Republican and Democratic voters in the (individual) United States? I'm happy with either a presidential or congressional election focus, but I suppose the latter would be preferable as I'm looking into gerrymandering.

I understand that collecting, modelling, and generating such data is presumably a major statistical effort that many private organizations undertake, but perhaps there is some decent publicly-available dataset?

migrated from gis.stackexchange.com Oct 30 '17 at 15:00

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