John McCain is hanging by a pretty thin thread, writes statistics guru Nate Silver at fivethirtyeight.com, and that thread is Pennsylvania. Two polls show a slight narrowing in Keystone country; one shows Obama’s lead down to 10 points, while another, right-leaning poll puts it at 5. But with no other good news for the Arizona senator yesterday, his overall win percentage probability fell to a new nadir of 2.8%.
FiveThirtyEight.com: Electoral Projections Done Right: Today's Polls, 10/31