Iowa head coach Kirk Ferentz, left, talks with Nebraska head coach Bo Pelini before an NCAA college football game, Friday, Nov. 23, 2012, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)

Nebraska quarterback Taylor Martinez warms up before an NCAA college football game against Iowa, Friday, Nov. 23, 2012, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)

Iowa quarterback James Vandenberg warms up before an NCAA college football game against Nebraska, Friday, Nov. 23, 2012, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)

Iowa tight end C.J. Fiedorowicz (86) is tripped up by Nebraska linebacker Alonzo Whaley, right, after making a reception during the first half of an NCAA college football game, Friday, Nov. 23, 2012, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)

Iowa fullback Mark Weisman (45) tries to break a tackle by Nebraska cornerback Andrew Green during the first half of an NCAA college football game, Friday, Nov. 23, 2012, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)

Iowa quarterback James Vandenberg, right, scores on a 1-yard touchdown run ahead of Nebraska cornerback Ciante Evans (17) during the first half of an NCAA college football game, Friday, Nov. 23, 2012, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)

Nebraska safety P.J. Smith (13) reacts after Iowa missed a field goal during the first half of an NCAA college football game, Friday, Nov. 23, 2012, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)

Nebraska running back Ameer Abdullah tries to break a tackle by Iowa linebacker James Morris, right, during the first half of an NCAA college football game, Friday, Nov. 23, 2012, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)

Nebraska head coach Bo Pelini waves to fans as he walks off the field after their 13-7 victory over Iowa in an NCAA college football game, Friday, Nov. 23, 2012, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)

Nebraska linebacker Alonzo Whaley carries off the Heroes Game trophy after they defeated Iowa 13-7 in an NCAA college football game, Friday, Nov. 23, 2012, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)

Nebraska running back Rex Burkhead (22) carries the ball during the second half of an NCAA college football game against Iowa, Friday, Nov. 23, 2012, in Iowa City, Iowa. Nebraska won 13-7. (AP Photo/Charlie Neibergall)

Nebraska running back Rex Burkhead runs off the field after their 13-7 victory over Iowa in an NCAA college football game, Friday, Nov. 23, 2012, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)

Nebraska safety Daimion Stafford intercepts a pass during the second half of an NCAA college football game against Iowa, Friday, Nov. 23, 2012, in Iowa City, Iowa. Nebraska won 13-7. (AP Photo/Charlie Neibergall)

Iowa tight end C.J. Fiedorowicz, left, catches a pass in front of Nebraska defensive back Corey Cooper, right, during the second half of an NCAA college football game, Friday, Nov. 23, 2012, in Iowa City, Iowa. Nebraska won 13-7. (AP Photo/Charlie Neibergall)

Iowa quarterback James Vandenberg throws a pass during the second half of an NCAA college football game against Nebraska, Friday, Nov. 23, 2012, in Iowa City, Iowa. Nebraska won 13-7. (AP Photo/Charlie Neibergall)

Nebraska fullback Andy Janovich makes a reception during the second half of an NCAA college football game against Iowa, Friday, Nov. 23, 2012, in Iowa City, Iowa. Nebraska won 13-7. (AP Photo/Charlie Neibergall)

Nebraska quarterback Taylor Martinez, center, is tackled by Iowa defenders from left, Steve Bigach, B.J. Lowery and Tanner Miller during the second half of an NCAA college football game, Friday, Nov. 23, 2012, in Iowa City, Iowa. Nebraska won 13-7. (AP Photo/Charlie Neibergall)

Nebraska linebacker Alonzo Whaley (45) celebrates with teammates Jason Ankrah (9), P.J. Smith (13) and Daimion Stafford (3) after intercepting a pass during the second half of an NCAA college football game against Iowa, Friday, Nov. 23, 2012, in Iowa City, Iowa. Nebraska won 13-7. (AP Photo/Charlie Neibergall)

Iowa head coach Kirk Ferentz reacts to a call during the second half of an NCAA college football game against Nebraska, Friday, Nov. 23, 2012, in Iowa City, Iowa. Nebraska won 13-7. (AP Photo/Charlie Neibergall)

Iowa head coach Kirk Ferentz, left, hugs his son, Iowa offensive linesman James Ferentz, during senior day ceremonies before an NCAA college football game against Nebraska, Friday, Nov. 23, 2012, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)

Iowa fullback Mark Weisman (45) runs from Nebraska cornerback Andrew Green (11) and defensive end Jason Ankrah, right, during the second half of an NCAA college football game on Friday, Nov. 23, 2012, in Iowa City, Iowa. Nebraska won 13-7. (AP Photo/Charlie Neibergall)

FILE - In this Nov. 23, 2013, file photo, Iowa fullback Mark Weisman (45) tries to break a tackle by Nebraska cornerback Andrew Green during the first half of an NCAA college football game in Iowa City, Iowa. Iowa should have a potent two-back punch next season with speedster Damon Bullock and bruising former fullback Mark Weisman, if both can stay healthy. The(AP Photo/Charlie Neibergall, File)