This is huge. Swann does not have to spend precious cash on a primary battle and can begin taking shots at Rendell now.
On the flip side, it lets the Dims get the destruction machine fired up quickly, and it gives them plenty of time to set up the massive vote fraud machine they'll need in Philadelphia to have a chance of stealing this election.
But even this is good for us, in that the Dims will now have spend huge amounts of money they previously didn't have to in order to defend Rendell's seat. And they'll have to go all out to defend it; as another poster pointed out, Swann may have long enough coattails to give Santorum a huge boost.