So you're a war supporter, and Iraq is going to hell. You want to pull the troops out, but doing so might require admitting defeat. And admitting defeat would mean that the bloodbath in Iraq was all for naught.
What to do? Easy.
Blame Iraqis. Talk about how the US came in, altruistic at heart, hoping to spread "freedom" to the Iraqi people. And then, pointing to the current broad-based rebellion, screech about how "ungrateful" the Iraqis are to the US for bringing said "freedom" to the country.
And then cut tail and run.
Watch the Right. It's gonna happen.