Krugman on the influence of race on voting
If we had to pick a “typical Republican voter,” he or she would be an upper-income resident of a poor state, and the “typical Democratic voter” would conversely be a lower-income resident of a rich state. But these are more subtle concepts, not directly readable off the red-blue map—and, in any case, we would argue that given the diversity among supporters of either party, choosing typical members is misleading.