Northwestern running back Venric Mark (5) celebrates a touchdown with teammates during the first half of an NCAA college football game against South Dakota in Evanston, Ill., Saturday, Sept. 22, 2012. (AP Photo/Nam Y. Huh)

Associated Press
Northwestern running back Venric Mark (5) celebrates a touchdown with teammates during the first half of an NCAA college football game against South Dakota in Evanston, Ill., Saturday, Sept. 22, 2012. (AP Photo/Nam Y. Huh)
Northwestern running back Venric Mark (5) celebrates a touchdown with teammates during the first half of an NCAA college football game against South Dakota in Evanston, Ill., Saturday, Sept. 22, 2012. (AP Photo/Nam Y. Huh)
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