LSU still 2 in polls
If LSU continues to play like they did this weekend, they will likely leap frog USC for the top spot. That being said, if USC does come out and blows out their own ranked opponents then USC will probably hang out to the top spot. But if both teams play like that then their won't be a doubt come BCS selection.
I'll use this as another time to state that to me is the downfall of preseason polling. It "locks" teams into spots they shouldn't be and forces other teams to go above and beyond to overtake them.