Quarterback Jake Waters, who led Iowa Western Community College to the 2012 NJCAA national championship, said on Twitter that O'Brien visited with him on campus, located in Council Bluffs, Iowa. He completed 73.3 percent of his passes this season for 3,501 yards and 39 touchdowns.
Waters' decision is likely to come down to Penn State or Kansas State, according to recruiting websites. Waters spoke with K-State quarterback Collin Klein Saturday night after the Heisman Trophy ceremony. Klein finished third in the voting.
Penn State has just one scholarship quarterback, sophomore-to-be Steven Bench, on its roster. The Lions have a commitment from Christian Hackenberg of Fork Union (Va.) Military Academy, rated as one of the top high school quarterbacks in the country.
In addition to Hamilton, the productive weekend for Penn State recruiting included the commitments of linebackers Zayd Issah of Harrisburg and Jonathan Walton of Daphne, Ala., and cornerback Anthony Smith of Randolph, N.J. Smith attended Valley Forge Military Academy this fall.
The Nittany Lions can sign only 15 players to national letters of intent in February because of NCAA sanctions, but some players have said they will enroll in January, which does not count against the 2013 maximum.
Senior Bowl-bound. Penn State's all-Big Ten defensive tackle, Jordan Hill, will play in the Senior Bowl on Jan. 26 in Mobile, Ala.
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