Junior running back Christian McCaffrey ranks second in the nation in rushing yards per game but is somehow considered to be experiencing a down season as he leads No. 6 Stanford into a Pac-12 showdown at No. 9 Washington on Friday night. McCaffrey's spectacular 2015 campaign in which he rushed for 2,019 yards and finished second in the Heisman Trophy balloting has made his 145.3 rushing yards per game seem pedestrian but only San Diego State's Donnel Pumphrey (199.7) has a better