I don't think the whole of Iraq would be under al-Sadr, but I think he would be the predominant force on the Shia side. Quite contrary to his sort of maverick, firebrand image, he's shown a propensity to deal with the other side, to look for compromises, to negotiate. You might have a loose federation [in Iraq].

It's always sort of amazing, sitting in Baghdad, to watch visiting dignitaries being received in the Green Zone by politicians who have usually very little support and seldom go outside the Green Zone.

But from the moment George Bush decided to overthrow Saddam, the people who were going to benefit here were the Shia, who are 60 percent of the population. So if you were ever going to have an election, then the Shia would take over.

Muqtada belongs to the most famous religious family in Iraq, which is the al-Sadr family. He's really the third in line. [Muqtada's father] drew his power from the first really important al-Sadr, Muhammad Baqir, who was executed by Saddam in 1980, together with his sister. So it's really a family of martyrs, and that's why Muqtada suddenly emerged from nowhere with the fall of Saddam.

Despite the fact that there's billions of dollars sitting in the Iraqi government reserves, somehow they are incapable of getting it out to the people. There are a very large number of people here who are on the edge of starvation. For those sort of people - a sizable chunk of people - that service makes them regard Muqtada as a sort of god.

There are sort of Kurdish districts there in Mosul, or there used to be, but the Kurds mostly fled or were driven out. The same is true of the Christians.

Muqtada is radical in the sense that he wants the U.S. occupation to end and has always said so from the beginning. Secondly, his support among the Shia really runs along class lines; it's mainly the poor who support him. His organization runs an enormous social network.