Freddie Mac, under the proverbial microscope for its business practices, has announced several major staffing changes aimed, at least in part, at improving its corporate image. The most surprising change was the forced departure of Mitch Delk, Freddie’s long-time chief lobbyist and the man credited with keeping congressional critics at bay for the past several years. Delk was let go because of allegations that some of his fundraising activities may have violated federal election