The ultimate predictor of the 2012 presidential election is: underwear sales.

CafePress.com, an online retailer of personalized t-shirts, undies and other household items, reports that it has seen a notable contrast in sales of pro-Obama underwear versus pro-Romney underwear. All four styles of pro-Obama undies on CafePress.com -- boxers, briefs, thongs and boy shorts -- are outselling the pro-Romney styles.

Interestingly, CafePress has another finding when it comes to political panties: while Obama supporters out-buy Romney supporters for pro-candidate undies, anti-Obama customers are out-hustling anti-Romney folks when it comes to anti-candidate skivvies. Almost no one has bought anti-Romney boxers and briefs and just a small amount have purchased anti-Romney thongs and boy shorts. Yet anti-Obama undies of all styles have been selling strongly.