Nothing.
He allowed the Shia leadership to push him around and force elections too quickly before Iraq was stable with its own security force.
He took away Commanders Exemption Funds which got rid of Commanders carrot and left them with nothing but a stick after that the insurgency really flared.
He allowed Chalabi to run the de-Baathification program which basically turned anyone who was in the previous government into second class citizens.
And, then he was given the Rresidential Medal of Freedom. What the hell?
The biggest problem I have long had with the President is he has rewarded loyality over competence. George J. Tenet got the Presidental Medal of Freedom on the same day as Bremer. The war would be going very differently today if Rummy was out after the 2004 election along with Powell.
Presidental Metal of Freedom
Agreed.