Dark-horse candidates for Heisman

Braxton Miller. Jadeveon Clowney. Teddy Bridgewater. They're the Heisman favorites for the 2013 season. But what about the dark-horse candidates? Travis Haney looks at some players, including Oregon's Marcus Mariota, Georgia's Todd Gurley and Alabama's T.J. Yeldon, who may become relevant as the season progresses. Read his story hereInsider.