Which American football running back won a Heisman Trophy in the 70"s?
1977 Texas Longhorns football team:  Earl Campbell won the Heisman Trophy in 1977 and led the nation in rushing with 1,744 yards. Earl Campbell: Earl Christian Campbell (born March 29, 1955) is a former American football running back who played professionally in the National Football League (NFL) for the Houston Oilers and New Orleans Saints.
Earl Campbell