Clinton
There was once a code among Presidents. The code was not to criticize those in the office once you have served in it.
If you had told me Bill Clinton would break this code by criticizing the man who succeeded him, I would have been ... well, not very surprised.
The former President still loves the spotlight, still loves to be loved, and still loves to be in the news. There are lots of current Democrats and critics out there who could make the same arguments he's making, and perhaps do it just as effectively.
But then we wouldn't get to see Bill on TV every day, would we?
Sometimes I think the reason Clinton wants Hillary to win in 2008 is so he can be an even more of a public figure than he already is.