New offensive weapon boosts Nebraska

Posted by ESPN.com's Tim Griffin

We all thought that quarterback Cody Green would be the agent of change to boost production in Nebraska's offense.

Surprise -- it's somebody else.

Freshman running back Dontrayevous Robinson capped a long drive with a 3-yard touchdown run to give the Cornhuskers to a 7-3 lead over Iowa State.

Roy Helu Jr. has picked up only two carries so far, leaving Robinson to slip into the role as the featured back.

The running game is helping quarterback Zac Lee look a little more comfortable passing. And that's the biggest reason for the Cornhuskers' early lead.