Clinton's Pennsylvania Push

The most recent polls show Sen. Hillary Clinton losing ground to her rival Sen. Barack Obama amongst voters in Pennsylvania. She's still ahead in most, but without a big victory in the Keystone State, it will be extremely difficult to win the nomination.

Obama has a 100-plus lead in delegates at this stage in the game, and it's worth posing the question: should Clinton drop out if she doesn't win in Pennsylvania by a wide margin? What do you think?