It seems that U.S. Attorneys and their assistants were not the only jobs in the Department of Justice (DoJ) that Gonzales, Rove(?) and company were politicizing. They were also placing unqualified people into the job of Immigration Judge. It got bad enough that so that they shut down appointments as Immigration Judge last December and the DoJ Inspector General opened an investigation of the procedures used for choosing new Immigration Judges.
The reasons and final outcome are not yet known, but we know a lot more than a short time ago. Go read EmptyWheel for more details.