What is the Biggest Dividing Line in America?

Alright everybody, this week I'm interested in finding out what you think are the biggest ideological divides in the United States. Here are a few categories to choose from, but I'm sure there are better ones out there I didn't think of.

I personally think that the biggest dividing lines are drawn by ideological differences rather than status, but I'm sure there are many out there who disagree with me. I'm going to stop typing now and let the discussion begin. We'll try to bring the discussion up on the show next Monday.