Think Progress has a good catch, from NPR:

According to Justice Department sources, after Kyle Sampson resigned as the attorney general’s chief of staff on Monday, he was going to work as a lawyer in the legislative section of the department’s environment division. The Justice Department started to set up a new office for Sampson in that section, and he only resigned from the department on Tuesday, when the scandal surrounding eight fired U.S. Attorneys continued to grow.

Yup. Mistakes were made.