LSU needs to do nothing other than keep winning each week. Everything else will fall into place, polls be damned.
As much as I'd love to dominate the game and win big, all LSU needs is a win. The rankings will take care of themselves and LSU is in perfect shape as far as ranking goes. If LSU goes undefeated they will be ranked no less than 2nd and will play for the national championship even if they win every remaining game by one point.
If lsu goes undefeated there is no way any other team, even an undefeated ou, should be ranked higher. No other team, ou or anyone else, has a tougher schedule.
Who cares if OU is ranked #1, they would have to beat LSU to remain there. Haven't we seen that movie before?
I am fine with a #2 ranking with lesser of a bullseye on the back. They just have to concentrate and win out.