Leaving Iraq, Honorably

Friend of mine had an idea last night that I thought made some sense; not sure how feasible it is: What if we pulled all of our troops out of Iraq and, since we know that it's going to be bloody, violent and deadly no matter when we leave, we (for lack of a better term)- compensate for the inevitable loss of life in Iraq by redepolying our troops to Darfur, where we can stop the ethnic cleansing and save thousands of lives, therefore at least having a net positive effect on humanity. It sounded a little "out there" to me, and my main concerns would be, how do we sell that to the American people and Congress- but is it doable??