I'd start Clausen. Your team is going to suck anyway this year, why not let Clausen play? Get some experience, take his shots, and gain a rapport with the young receivers. You're looking at 3 wins tops in the first 8 either way, take the freshman.
After watching Saturday's game, Clausen should definitely start because Jones and Sharpley suck. I was really high on Jones because dual threat quarterbacks are so valuable on this level, but its obvious from Weis' playcalling that Jones is not a dual threat and Sharpley is the reincarnation of Pat Dillingham.
Might as well let Clausen take his lumps against USC and PSU, hopefully get 6 wins and lead us to a minor bowl victory (I know its a stretch).