early results

I see CNN is calling PA for Casey with 4% of votes counted. Are they that sure, or jumping the gun a bit?

Here in Knoxville (Knox County, actually) there are no reported results yet that I can find, although other counties in the eastern half of the state have returns already trickling in.

And how about Lieberman ahead in Connecticut? Assuming he pulls out a win, will he serve this next term as an Independent, or will he be grudgingly or gratefully welcomed back into the Democratic Party?