I think hanging in there in Iraq is a principled position. We broke it, we bought it, to quote a former Secretary of State. I also think advocating withdrawing the troops immediately is principled, too, altho I disagree with it. Leaving out the casus belli (WMDs, UN Resolution 1441, etc., ad nauseum) discussion, this recent survey of the Iraqi people, if accurate, should be probative. I do think that the American people (most of us, anyway) want to do the right thing now regardless of party stripe.
Most Iraqis feel a continued US/UK military presence exacerbates the butchery. I happen to disagree on the whole because there is a tendency in the non-First World to blame external causes for one's own society's deficiencies. But I could very well be wrong, and I don't live in Iraq.
Still, many Iraqis feel the troops should remain in the near term. Virtually none for the long term, of course. Who would? How embarrassing, that any society should become the ward of another state.
As for the denouement, we are already there---regardless of the ineptitude of the administration's PR, the reality is that we are already in a postwar Iraq: 77% of the Iraqi people feel all this chaos and suffering in deposing Saddam was worth it. Howbouthat?
I myself am surprised, mostly that the populace can discern so quickly that compared to the hell that was Saddam's Iraq, the current purgatory pales. Contrary to popular belief, people are not stupid.