Florida has entered the top 10. Michigan and Penn State have fallen out of the rankings. The AP Top 25 poll has underwent significant changes after Week 4. LSU and Florida have risen in the rankings, while Michigan, USC, and others have declined in position. New polls indicate setbacks for Ole Miss and Tennessee. ESPN and other sites have revised the rankings, with Mississippi possibly exiting the top 5. Several ranked teams suffered defeats in Week 4, causing significant changes.