Second update and warning: Apparently there was a bug in the analysis described below. Please disregard, and look instead at my later post.
Michael Gastner, Cosma Shalizi, and Mark Newman have developed some astonishing maps of the US election results. There really are two Americas, but it’s not the two people talk about. Rather, US Counties divide up into two sets:
1. Counties (about 400, for a total of 6 million people) where essentially everyone votes Democrat.
2. The remaining Counties, which follow a more or less typical Bell curve, with the mean County about 60% Republican, and 40% Demcrat.
Their results are so stark that I have to wonder if there’s something wrong with their data. (Might we be seeing gerrymandered counties?) Assuming there’s nothing wrong, that’s an awful lot of Democrats who will never meet a Republican!
Update: So why does this happen? Maybe it is all gerrymandered counties, or maybe it’s not. If not, what else is going on? Why are those results that way?