I agree with Atog. For some reason, traditionally, they are a jekyl/hyde team. As soon as you think they might actually be good, they put up stinkers. Just when you think they're down, they pull off the upset.
I think ND is peaved due to last year and last week, and will probably play their best game. Wouldnt mind ND being knocked down another peg, but I'd be surprised if ND doesnt have the win in hand early in the 4th quarter.