AHC: early US withdrawal from Iraq

It's one of those "I know the storm I want, now where should my butterfly flap?" questions.

Assuming that the 2003 invasion goes broadly along the lines of OTL. what are some reasonable scenarios that would encompass an early US withdrawal from Iraq?

Is it possible to get a presidential election campaign the next year that would include a committment for a immediate start to the pullout after the inauguration? Say, if OBL or Saddam or both were captured or killed earlier?

Would balkanizing Iraq into successor Shia, Kurd, and Sunni mini-states be a likely consequence?

Is a stable and loyal Iraqi client-state a possibility at that time?
 
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