I haven't found info to completely back up my claim. I've always heard that Democrats are more likely to be blue collar, high school educated people, low income people, and highly educated college professors, whereas Republicans tend to be middle class, small business owner or corporate workers with a college degree.

Like I said, I haven't found the magic evidence to back up my claim just yet, but here's a Washington Post article about how the parties are changing and that more of the less educated, low income people are looking towards Republicans and more of the highly educated, rich people are looking towards the Democrats. The article indicates that this is a diversion from the norm.

I'm still searching....
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You can't be a real country unless you have a beer and an airline. It helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer.
--Frank Zappa