We Never Found Out What Happened to Josh Lyman

Emanuel is by my count the fifth WH Chief of Staff who previously served in elected office. Two (Panetta and Howard Baker) retired on their own terms; two others, Sherman Adams and John Sununu, resigned after scandal, but odds are in both cases the scandal was a result of the enemies created by their style in office rather than a result of particular ethical shortcomings (I'm confident that's true of Sununu, but I'm only really guessing on Adams -- I don't know the history well enough to say).

I think it's an fairly safe prediction that Rahm ends up more like Adams/Sununu than like Panetta/H. Baker. He's most likely an excellent chief of staff, but odds are he's making plenty of enemies, and when he does something dumb they'll all pounce. Just the nature of the job.