If Wisconsin wins the Big Ten, they won't get in. If PSU wins the Big Ten.....BIG maybe. Alabama is a lock, Ohio State is too if they finish 11-1. When Clemson wins out they are a lock.
So really it's just fighting for the last spot:
-Louisville has been atop the rankings since after week 1. They look to have the Heisman winner. And they have a fun offense to watch, that brings in viewers. Only loss to their division rival and eventual champ Clemson.
-Penn State still has a negative image since we are only a few years removed from the scandal. Plus they will have 2 losses, one to a Pitt team that isn't ranked and another where they got trounced by UM.
-Washington's only hope is to win out and win title game. They have a solid chance of doing that, but their remaining schedule to do so is much harder than the other two already mentioned. If they can manage that, the 4th spot hands down goes to them. If they can't, they are 100% out.
-The Big 12 winner will not get in, no matter what.