Before Clanton joined Campbell's staff in Ames, the Cyclones averaged just 108 yards per game.
Washington has appeared in at least 10 games a season in three years with the program.
Both true freshman starters have cracked the top 10 for the first time this season.
"He embraces our expectations, not as pressure, but as a privilege."
Penn State racked up five bonus-point victories with a pin, two technical falls, and two major decisions.
The Nittany Lions had a 39-2 takedown advantage.