From NBC's Lauren Appelbaum
While a new poll among Pennsylvania voters shows Clinton leading by 18 points, both Obama and her lose to McCain in head-to-head match ups. According to the Strategic Vision (R) poll, which will be released tomorrow, Obama fares better in a contest with McCain.
In the Democratic contest in the Keystone State, Clinton leads Obama outright in Pennsylvania, 56%-38%.
But in hypothetical match ups for the general election, McCain is ahead of Obama, 47%-44%, with 9% undecided. Against Clinton, the Arizona Republican leads 48%-42%, with 10% undecided.