Franklin and Marshall College (PDF). 6/16-21. Adults. MoE 4.1% (No trendlines on primary polling)
Democratic primary (MoE 6.1%)
Specter 33
Sestak 13
Undecided 48
Remember, Specter has universal name recognition, yet only a third of Democrats in the Keystone State are supportive. These are not great numbers for Specter. And throughout the entire state, among all groups, the gutless Specter is bleeding support at an astonishing rate:

It's obvious that Republican would ditch Specter, but he also suffered a net favorability drop of 24 points among Democrats, and 22 points among independents. That's brutal. And on the re-elects, while Dems remain luke-warm, those numbers from independents are alarming -- 69 percent want someone else.
Sestak may have a new argument on his plate: electability.
"I think what he's got going is the worst of both worlds," Madonna said. "Republicans have fallen away from him because he left his party, and Democrats are unhappy with him for lots of different reasons. . . . Voters have a lot of uncertainty about what he is likely to do."