 Kurt Warner joins us on Sports Byline, the former NFL quarterback who played 12 seasons for the St. Louis Rams and Arizona Cardinals. And his career, which saw him ascend from an undrafted free agent to a two-time MVP and Super Bowl MVP, is regarded as one of the greatest stories in NFL history. He's also been inducted into the Pro Football Hall of Fame. His story and outstanding career is now a movie, and it'll be coming out at Christmas, called American Underdog.