The libs are trying to position themselves to take credit when the phased withdrawals begin by their constant yammering about pulling out. When it starts, later this year they will be jumping up and down waving their arms and shouting "see, see, we made them do it, we did, we really did"
They are also counting on President Bush following the Reaganesque theory that it doesn't matter who gets the credit for doing a good thing as long as it gets done. This is one time that W needs to abandon that usually good theory.