According to CQ Politics, not many…

[…] a CQ Politics analysis of the political circumstances in Pennsylvania’s congressional districts, detailed below, projects an edge to Clinton — but by just 53 district-level delegates to 50 for Obama under the Democratic Party’s proportional distribution rules.

These numbers suggest that Clinton, even with a victory in Pennsylvania, would make only a small incremental gain against Obama’s overall lead in the delegate race.

Of the state’s remaining 84 slots, only 55 pledged delegates will be distributed based on the statewide popular vote, with the state’s remaining 29 seats going to unpledged “superdelegates.”

Check over there for the district by district allocation guesses…if you have absolutely nothing better to do with your day.

Politics How Many Pledged Delegates Can Hill Gain From PA?