Likely with the soft USC schedule. Auburn's easy to screw. USC and LA is a big TV market and the current favorites of the media. The BCS is nothing more than a glorified beauty pageant. Until it is settled on the field it will only be a "mythical" championship.
USC's non-conference includes ND, Neb and Arkansas.
Auburn plays Buffalo, Ark St., etc. They screw themselves with a sissy schedule.