Should clinton drop out of the presidential race if she loses pennsylvania?

If hillary Clinton loses Pennsylvania I wonder if she will still stay in the contest. Many are saying that she is already damaging the party which I do not believe to be true. I do however feel that if she loses Penssylvania she should witdraw from the presidential race. If she loses this state it will be clear that there is more support for Barack Obama. Are there any blogger thoughts on this?