Hillary is going to hammer him on the campaign trail, maybe not the debate, but this win and next few will be crucial, maybe it could end before the convention.
It could also sway some SD's that have endorsed and even pledged delegates.
Pennsylvania outcome could sway undecided super-delegates
WASHINGTON (AFP) - The outcome of the Democratic presidential primary in Pennsylvania, pitting Hillary Clinton against Barack Obama April 22, could sway undecided "super-delegates" now expected to decide who gets the party's nod.
Obama has the support of 226 so-called super-delegates and Clinton 252. Those are out of a total of some 800 super-delegates to the party convention in Denver August 25-58; some are party bigwigs and many are elected offcials.
What makes their role unique is that the super-delegates are utterly free to vote their own minds.
The candidate who manages to convince them that she or he is the party's best hope in the general election against presumptive Republican nominee John McCain is all but a shoo-in for the Democratic nomination.
"The superdelegates attempt to look at electability, and there is still a lot of water to go over the dam on that subject before most of them have to commit," Phil Bredesen, the Tennessee governor and an undecided superdelegate, told The Wall Street Journal recently.
http://news.yahoo.com/s/afp/20080414/pl_afp/usvotedemocrats;_ylt=Ans.MfMjjsFbP9q_z2VwAiLCw5R4