If USC beats Notre Dame, Georgia and Alabama would presumably be #1 and #2, but they'll play each other in the SEC title game so one of them will have to lose. Not including K-state and Oregon, the next highest ranked teams are Florida (one loss, not in the conference title game) and several 2-loss SEC teams (LSU, Texas A&M, South Carolina). The one loss teams left would be Kansas State (big loss to Baylor), Oregon (OT home to Stanford), Florida State (will play Georgia Tech in the ACC title game) Clemson and Louisville. Florida and Florida State play each other and will play each other so one of them is out. Notre Dame would also have one loss. So, if Notre Dame loses to USC, who plays the SEC champ in the national title game?