Wealthier areas are more democratic, wealthier individuals are more republican. Kind of a brain-hurty paradox, I'll admit, but it's true. Jonathan Haidt is a place to start googling if you want to read more. I can't remember the full explanation for the democratic areas thing, but the wealthier people in those areas are more republican for 2 obvious reasons: the better things are going for you, the less you think things need to change; and the Republicans resist all changes except tax cuts for the rich.