Pennsylvania trending blue, just like Ohio

Hours after Quinnipiac's Ohio poll, a new Keystone poll from Pennsylvania confirms that Democrats are doing great right now. But it also demonstrates how impossible it is to draw conclusions about electability. Keystone divided its sample in two subsamples, asking about different matchups (Note: Just like the CO poll from earlier today, Keystone did not asking about Edwards - which is rather strange. Do they really think McCain has a better chance of getting the GOP nomination than Edwards the Democratic one?!).

• Sample A: Against Giuliani, Clinton leads by 9, while Obama leads by 7. Against McCain, Clinton also runs a tiny bit better than Obama: she wins by 8, he leads by 5. All these results are reversed from June, where the Republicans led comfortably. So great news.

• Sample B: Here again, both Democrats beat both Republicans, but Obama runs dramatically better than Clinton. She only leads Romney by 1 (this must be the first poll in which Romney polls so much better than Giuliani), but Obama wins by 15 points - which is really a huge difference. The same thing is true when it comes to Thompson, down 5 against Clinton and down 20 against Obama.

• Conclusion? Well this might be the first time Romney runs so much better than Giuliani in a general election poll, which is probably to be attributed to differences between the subsamples. But when it comes to comparing Obama and Clinton's relative performance, we once again fail to get a coherent story: Obama runs 15 points ahead of Clinton in sample B, but against the most competitive Republicans, Clinton holds her own very well. What gives?
  

• But for now, remember one thing: Democrats are winning all 8 match-ups in a crucial state (and Clinton's favorability rating does a huge jump forward). Just as in OH this morning, they are pulling ahead.