city-data.com Apologies if this has been posted previously; I cannot find it using search.
Go ahead and look at the area or state of your choice, and look at the map to the right. It has a huge pull-down menu (default choice is "median household income")
With vast sets of data. I would bet one could make all sorts of inferences about social and political situations from it.
Really, go look and play a bit. I'm learning lots about the lumbering, socially tottering area in which I call home.