Who is Tanner Mangum? The Cougar QB talks about how he's changed

There is no question who will be BYU's starting quarterback against Portland State and the rest of the season. But Tanner Mangum has come a long way since he was forced into duty as a freshman. KSL Newsradio's Cleon Wall finds out how he's changed in the past few years. (Photo: Spenser Heaps/Deseret News)