From Steve's site:

...I found a single obscure factor that correlates with Bush's share of the vote in the 50 states plus D.C. at the 0.86 level, which is extremely high. This appears to be the key to who votes for whom....

Any guesses? I'll throw out hair-dye purchases. Might be time to get The American Conservative electronic edition.

Update: Check out Jody's crunching of marriage numbers. Not too surprising.