All Or Nothing

If the surge is unacceptable, the better option is to cut our losses and withdraw altogether. In fact, the substantive case for either extreme -- surge or outright withdrawal -- is stronger than for any policy between. The surge is a long-shot gamble. But middle-ground options leave us with the worst of both worlds: continuing casualties but even less chance of stability in exchange. Moderation and centrism are normally the right instincts in American politics, and many lawmakers in both parties desperately want to find a workable middle ground on Iraq. But while the politics are right, the military logic is not.

Obviously, President Bush's stay-the-course approach is bankrupt. It shows no signs of producing any self-sustaining - and that is the metric - unified, stable Iraq. But the various gradual, partial withdrawal proposals by many Democrats and dissident Republicans are not realistic either. The passions that have been unleashed in Iraq are not going to accommodate some partial withdrawal plan, where we just draw down troops, do less patrolling, more training and fight Al Qaeda types. It's a fantasy.

The minute we start to withdraw, all hell will break loose in the areas we leave, and there will be a no-holds-barred contest for power among Iraqi factions. Our staying there with, say, half as many troops, will not be sustainable.