USC back-up QB Mitch Mustain cannot get confirmation from the team that he will start this week when the Fighting Irish travel to tinseltown for a classic college football rivalry. Starting QB Matt Barkley, who suffered a high ankle sprain in the first half of USC’s embarrassing loss to Oregon State last week, is listed as the starter despite being on crutches and in street clothes all this week. Even if Barkley does not practice this week, coach Kiffin...