I smell a 'RAT' here. I think these extra couple of points is a 'set up' for a final week fake 'pull back' to give the impression of an Obama fake 'come back'.
Actually, I believe Gallup is building in that air knowing full good and well some % of the 2% Undecided will indeed wander back to Bobo in the last weekend before the election, regardless of debates, ads, surprises, etc...
For instance, Gore got a 0.8-1.2% return that dumb pollsters blamed on the drunk driving story [Rove: "Before the news broke, we were up … in Maine … Bush went on to lose Maine … If Bush did drop 2 percent nationally in the vote because of the DUI revelation, then it probably cost him four additional states that he lost by less than 1 percent — New Mexico, Iowa, Wisconsin, and Oregon."], and smart pollsters blamed on the historically perpetually lost sheep (ie Dems) returning to their incumbent in the final days of an incumbent election, albeit of the rarish VP-for-Pres-3rd-term type.