Who will the left blame for all their failures and the worlds ills when Bush leaves office?

I think it has become so common place in these people to have a knee jerk reaction and blame bush for everything I'm not sure what they will do when he leaves office? Will they just continue to blame him anyhow with the same irrational thought process... or will they start to blame Romney, Rudy or Huckabee when one of them take over? If they pull off an upset and win the election... will they blame Bush when things get worse and their lack of ideas don't solve anything?