Former Oakland Raiders head coach Bill Callahan accepted the head coaching position at Nebraska Thursday after a crazy week in which the Cornhuskers tried to hire Mike Zimmer, the Dallas Cowboys' defensive coordinator. Callahan will be introduced as Nebraska coach at an afternoon news conference. Once he heard through his agent, Gary O'Hagan of IMG, that Zimmer pulled himself out of the running for the job, Callahan pushed for it. A former offensive line coach at Wisconsin, Callahan has always desired to be a head coach in college, and there had been some thought he would be considered at Notre...