The sad thing about coverage of issues such as the Iraqi Constitution is that it is difficult to really find out what the issues are.
I would assume that there are elements within Iraq that would reject any constitution written during the occupation.
The irony, of course, is that the US has repeated the history of the 1920s. The key political issue then was foreign (RAF) bases. What I found really odd was the argument in the House of Commons against setting a date for withdrawal.
The argument was that the insurgents would not give up if they were given a date for withdrawal. Given that the insurgents' main aim appears to be to get rid of the occupiers (much that I need to source this) one would presume that an early date for the end of the occupation would actually give them a reason to hold back.
Still, it appears that with members of the armed forces in the USA turning against the occupation the chances are that the USA timescale will be shortened and some specious argument generated that changes the specious arguments currently being used.
Tony Blair will then act on the coattails of George Bush.