Election season is upon us. I never really realized why I disliked the "purple" election map so much; I just knew that the visual grapeyness doesn't indicate locales where moderates live, but instead shows groupthink enclaves and leaves the viewer to guess at the polarization by degrees of fine color discrimination.
This Medium article talks about refining the coloration with RGB in a way that sheds the purpleness and reveals the nuanced shades of red and blue. The polarization is still there, but the regional inclinations are a little less mysterious.
While you're there, check out the article on zero water in the CA Central Valley.