ESPN B1G power rankings after week 4.
http://espn.go.com/blog/bigten/post/_/id/124378/big-ten-week-4-power-rankings-ohio-state-back-on-top
http://espn.go.com/blog/bigten/post/_/id/124378/big-ten-week-4-power-rankings-ohio-state-back-on-top