 He spent his first two years at Michigan serving as one of the primary <unk> to Mike Hart . In his third year , he emerged from a field of five runners who were vying to replace Hart , including two true freshmen , as the leading rusher and scorer . He has shared starting responsibilities in his junior and senior seasons . He entered his senior season on the watch lists for the Doak Walker Award and the Maxwell Award . ESPN.com ranked him as the 22nd best player and third best running back in the Big Ten Conference before the season started . 
