I actually think Clinton's negatives are finally starting to get to her. Even so, she has no other choice but to continue on her present course of attacking Obama personally, and trying to scare the voters for her votes.
She is fighting a war on several fronts in this election.No matter how you define it or explain it; Obama'svictories since Super Tuesday guarantee that he must be on the ticket for the Dems in some form. I think Hillary understands this at least.
Even with her latest win in Pennslyvania, she will need to have landslide victories very soon in order to try to get more delegates; and even more importantly; hold onto her current ones from jumping. Mathematically, she is trying to stay afloat and hope that somehow the DNC will give her all of Michigan and Florida; which is unlikely.
Another problem is her continued shortfall in the campaign funding department. Soon, money will start drying up as her contributors start to see this equation.
Her Pennslyvania win didn't alter the delegate count in no great way. It did, hoever; give her impetus to survive for the next set of primaries. She will have to survive from primary to primary; until the money runs out. Then the delegates run out also.