More on the record

I just read this summary of Bill Clinton's remarks on Charlie Rose vis a vis Obama, and because I have a faulty memory, I'll pose my comment in the form of a question:

Has any other ex-president in recent memory taken to making running negative commentary against someone in his own party running for president? Does it seem to anyone else that this campaign is going to cement Bill Clinton's legacy as a self-serving egomaniac in American politics?