In the history of the Heisman Memorial Trophy, only two colleges have had back-to-back Heisman winners — in 1945 and 1946 by Army with fullback Doc Blanchard and running back Glenn Davis winning the award. Then 28 years later when Ohio State running back Archie Griffin won the award twice in 1974 and 1975. Coming off Marcus Mariota’s Heisman Trophy season, could Oregon be the …