The Pac-12 Network ran a ”Mariotathon” on Friday as tribute to Oregon’s All American quarterback Marcus Mariota and a prologue for the Heisman Trophy Award ceremony tonight on ESPN.  The Heisman candidate has enjoyed an all-you-can eat awards buffet, becoming Oregon’s first ever Walter Camp Award, Maxwell Award and Davey O’Brien National Quarterback Award winner. Mariota also received the Polynesian College Football Player of the Year Award and the Johnny …