That's a tough one. Even when I don't have what I would describe as an active interest, we almost always have a social get-together that centers around the game, and I will develop an active rooting interest leading up to the game just because. For the one you mentioned, I was a pretty active Peyton fan, so I was rooting HARD for the Colts.
Last one, I was rooting for the Pats because history and because they finally kind of won me over after all this time.
50, I was rooting for Broncos because I like the team and because Peyton.
49, I was rooting against the Seahawks because Seahawks.
48, I was rooting for Broncos because Broncos/Peyton. Also, I was rooting against the Seahawks because Seahawks.
47, I was rooting for 49ers because they are my team.
46, I was rooting for Giants because...well, I was rooting more against Pats. But that matchup just frustrated me to no end because I didn't want to root for either team.
45, I was rooting for Packers because I love the Packers and didn't hate Rodgers that much.
44, see above.
43, I was rooting for Cards because...I dunno. Cool for them to win one, I guess? And Larry Fitzgerald is a standup guy who I felt deserved a ring.
42, see 46.
41, I was rooting for Peyton. But I honestly don't remember watching this one and may not have. So I guess there's the answer. And the stretch before this wasn't very exciting for me either and gets a lot of "who cares?" when I look back at the matchups.