This survey says that, among those who care, Democrats tend to favor the Saints, Republicans the Colts.
Certainly true at my house.
And it's not just because hundreds of manly Saint fans donned women's dresses the other day for a marvelous French Quarter parade. It was a tribute to the late Buddy Diliberto, a legendary Crescent City sportscaster (credited with inventing the Ain'ts paper bag hats) who said he'd wear a dress if the Saints ever made it to the Super Bowl. He's not around to see it, so his successor, former QB Bobby Hebert, took up the challenge for him.