At this point, LSU and USC are clearly the top two teams in the country.  However, with each of them having at least 3 tough games left on the schedule and given the frenzy of upsets from this past weekend, it is certainly possible that at least one of them suffers a loss.  I posted the scenarios necessary for each top 10 team to make it to the championship game.

LSU - Must beat Florida, Auburn, Bama, Arkansas, and the SEC East Champion; can get lucky with 1 loss (40%)

USC - Must beat Oregon, Arizona St, Cal, UCLA; can get lucky with 1 loss (50%)

Cal - Must beat Arizona St, UCLA, USC, and Washington; would have to get extremely lucky with 1 loss (20%)

Ohio St - Must beat Michigan, Wisconsin, Purdue, Michigan St, and Penn St; also, LSU or the winner of USC vs Cal must lose (30%)

Wisconsin - Must beat Michigan, Penn St, and Ohio St; also, LSU or the winner of USC vs Cal must lose (10%)

BC - Must win out and have 2 of 3 happen: winners of USC vs Cal, LSU vs Kentucky, and Ohio St vs Wisc lose; must beat USF in BCS standings (10%)

South Florida - Must win out and have 2 of 3 happen: winners of USC vs Cal, LSU vs Kentucky, and Ohio St vs Wisc lose, must beat BC in BCS standings (5%)

Kentucky - Must beat LSU and rest of SEC schedule; also, winner of USC vs Cal or Ohio St. vs Wisc must lose (5%)

Florida - Must beat LSU and rest of SEC; only 1 undefeated team can be left standing (10%)

West Virginia - It would take a lot of losses at the top, but their schedule isn't bad (5%)

Everyone Else - Anyone in the top 20 has a small chance (15%)

* Note - the total percentage should be 200% to account for 2 teams playing in the championship game