I think you've got something there. Obama bumper stickers are not common in our neck of the woods, but every one I see is on a late model car or SUV.
Meanwhile, most of us with TEA Party friendly bumper stickers are driving old vehicles.
How does this fit with the tired old canard about the Democrats being the party of the little people?
Democrats are for snotty know-it-all elitists, the homosexual, anti-God, and environmentalist constituency, and the greedy crony capitalist thugs.
Oh, yeah, the unions. They are a real motley crew.