He's tanned, He's Rested, He's Ready. Vote Clinton 2004.
(From a minimal butterfly world in which the 22nd and 25th Amendments have slightly different wording. Instead of denying any President more than two terms or ten years in the White House, the amendments prohibit any President from serving more than two terms or ten terms consecutively. Therefore a former President becomes eligible for the Presidency after a four year interim. This change in wording doesn't affect things too much. Eisenhower has no interest in running in 1964, Nixon is far too disgraced to run in 1980, Reagan's Alzheimer's disease precludes a Reagan 1996 campaign. Bill Clinton is the first former President who has an opportunity to take advantage of the loophole. After much convincing former President Clinton decided to enter the 2004 campaign. Yes I know I'm torturing butterflies here, and the probability of this happening may well be ASB. But still Bill Clinton vs. George W. Bush is a scenario I've been thinking about, regardless of the improbability involved.)