Northwestern running back Venric Mark, center, is tackled by Penn State linebackers Glenn Carson (40) and Michael Mauti (42) during the first quarter an NCAA college football game in State College, Pa., Saturday, Oct. 6, 2012. (AP Photo/Gene J. Puskar)

Associated Press
Northwestern running back Venric Mark, center, is tackled by Penn State linebackers Glenn Carson (40) and Michael Mauti (42) during the first quarter an NCAA college football game in State College, Pa., Saturday, Oct. 6, 2012. (AP Photo/Gene J. Puskar)
Northwestern running back Venric Mark, center, is tackled by Penn State linebackers Glenn Carson (40) and Michael Mauti (42) during the first quarter an NCAA college football game in State College, Pa., Saturday, Oct. 6, 2012. (AP Photo/Gene J. Puskar)
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