Talk Left's Big Tent Democrat breaks down the demographics samples in the polls to help explain the differences. In short, the polls have given different statistical weight to how many African-Americans will vote in the primary and how the white vote is breaking down.
Over at Philly.com, Will Bunch says predictions are a bad idea, but adds:
That said, there's one thing that seems impossible to avoid about 32 hours before the polls FINALLY close here in Pa. And that is this, that there is virtually no way that Barack Obama can win here. I don't know the exact margin of victory, but a Hillary Clinton triumph seems certain.
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