Krugman weighs in

Staying What Course? - New York Times:

In effect, America has been taken hostage. Nobody wants to take responsibility for the terrible scenes that will surely unfold if we leave (even though terrible scenes are unfolding while we're there). Nobody wants to tell the grieving parents of American soldiers that their children died in vain. And nobody wants to be accused, by an administration always ready to impugn other people's patriotism, of stabbing the troops in the back.

But the American military isn't just bogged down in Iraq; it's deteriorating under the strain. We may already be in real danger: what threats, exactly, can we make against the North Koreans? That John Bolton will yell at them? And every year that the war goes on, our military gets weaker.