Bush won't go down in history as the worst ever - there are too many complete failures (like Grant, John Adams, Carter) for him to be classified as such.

How about Kerry? Look at the news yesterday and today. Bush announces planned troop withdrawls (and eventual base closures?) in Europe. Kerry blasts him on this in front of the Veterans of Foreign Wars despite having said last month that he was for scaling down overseas military deployments.
Why the flip-flop? Kerry's campaign manager called it "new thinking"!
More likely he sees an opportunity to curry favor with the Europeans (who - despite their loathing for Americans and their opposition to our foreign policy and ideology - really love the influx of cash that our military bases bring), a chance to paint himself as pro-military at the last minute (that is absurd given his voting record in the Senate and his rhetoric after the Vietnam War), and continue his anti-Bush attacks on all fronts.

I don't think there is much need to worry, though. Looks like Bush will get re-elected, IMO.