I am a fan of Nebraska. Therefore, I will be rooting for OSU. Like it or not, an OSU win in the MNC DOES affect Nebraska, and the B1G in general. It improves the conference perception, and though I have never cared much for OSU one way or the other, an OSU MNC win looks good for all team in the B1G.
For that reason, I think everyone should be rooting for Mizzou and OSU today.