Obama leads Romney, 46-43, down a hair from a five-point advantage (47-42) in August. He has also declined against newly risen Herman Cain, from a 14-point lead (50-36) to half that (49-42). Obama leads Ron Paul by nine, 48-39; Rick Perry and Michele Bachmann each by 11 (50-39 and 51-40, respectively); and Newt Gingrich by 14 (52-38). All of these changes except the one against Cain are statistically insignificant, but it still makes the state closer than the president would like. Then again, Obama’s huge 2008 win was unprecedented in recent history. Al Gore won this swing state by less...