Florida has entered the top 10. Michigan and Penn State have fallen out of the rankings. The AP Top 25 poll has seen major shifts after Week 4. LSU and Florida have moved up in the rankings, while Michigan, USC, and others have dropped in position. New polls indicate losses by Ole Miss and Tennessee. ESPN and other sites have revised the rankings, with Mississippi possibly exiting the top 5. Several ranked teams lost in Week 4, causing significant changes.