In all three gallup polls today, the registered voters and both likely voter polls, the numbers are tightening. Obama lost 2% in a couple and Mac gained 2% in a couple of them. These national polls are generally two or three days ahead of what you see in the individual state polling. I've watche the Gallup's for over a month and don't remember seeing a shift down for Obama in all 3 polls, on the same day. This is a good sign for McCain that there may be some very serious tightening going into the homestretch.
This bears watching over the next couple of days as close as it will be in the battleground states.