Polls of Pennsylvania in the week after Clinton's win in Ohio show her ahead of Barack Obama, on average, 53-38.
Clinton spent nearly 5 million dollars in PA and campaigned all over the state. Obama spent a bit more than twice that and also campaigned all over the state.
So what did they get for their money?
Clinton's pre-campaigning number above (53%) is substantially similar to what she finished with after the voters had their say (54%).
For his money Obama moved from about 38% to 46%. So he gained 8 points through his campaigning and ad buys and prevented a blow out in a state with unfavorable demographics.
It'e estimated that Clinton will win about 11 net delegates when the day is through and about 200K more in the pop vote.
Using the RCP count Obama is ahead (including supers)127. So after 6 weeks of campaigning and 5 million spend she has knocked less than 10% off of his delegate lead.
With NC coming up Obama should get that right back plus much of the pop vote that he lost.
When Obama spends money and campaigns it has an effect on his numbers. On the other hand it looks like Clinton has a ceiling and can only maintain her numbers, at best, even when she campaigns her butt off.
It seems to me that her ceiling is her doom. If she can't improve then she can't catch up.