As we mentioned in the Roundup this morning, Mayor Adrian Fenty has fired D.C. School Superintendent Clifford B. Janey, and announced this morning at a press conference that he would be replaced by Michelle Rhee, in a new position as D.C. Schools Chancellor. The Post has a good story up already with some details of Rhee’s background: she’s the the founder of New Teacher Project, a nonprofit group based in New York that trains mid-career…