President Bush doesn't lack for critics when it comes to his Iraq policies, but the smartest and most devastating of these is Peter W. Galbraith, a former United States ambassador to Croatia.

Yesterday, after reading gloomy press accounts about the proposed Iraqi constitution, I thought it might be interesting to hear what Galbraith himself had to say. I finally tracked him down in Baghdad (at God knows what hour there) and found that far from lambasting Bush, Galbraith was more complimentary about what the administration has just achieved than anybody else I spoke to all day.

"The Bush administration finally did something right in brokering this constitution," Galbraith exclaimed, then added: "This is the only possible deal that can bring stability. ... I do believe it might save the country."

Galbraith's argument is that the constitution reflects the reality of the nation it is meant to serve. There is, he says, no meaningful Iraqi identity. In the north, you've got a pro-Western Kurdish population. In the south, you've got a Shiite majority that wants a "pale version of an Iranian state." And in the center you've got a Sunni population that is nervous about being trapped in a system in which it would be overrun.

In the last election each group expressed its authentic identity, the Kurds by voting for autonomy-minded leaders, the Shiites for clerical parties and the Sunnis by not voting.

This constitution gives each group what it wants. It will create a very loose federation in which only things like fiscal and foreign policy are controlled in the center (even tax policy is decentralized). Oil revenues are supposed to be distributed on a per capita basis, and no group will feel inordinately oppressed by the others.

The Kurds and Shiites understand what a good deal this is. The Sunni leaders selected to attend the convention are howling because they are former Baathists who dream of a return to centralized power. But ordinary Sunnis, Galbraith says, will come to realize this deal protects them, too.

Galbraith says he is frustrated with all the American critics who argue that the constitution divides the country. The country is already divided, he says, and drawing up a constitution that would artificially bind three divergent societies together would create only friction, violence and civil war. "It's not a problem if a country breaks up, only if it breaks up violently," Galbraith says. "Iraq wasn't created by God. It was created by Winston Churchill."