Clinton may have been indiscreet, but he didn't violate the public trust, in his affair with Monica.
John Aravosis picks up on a disclosure that the White House may not have conducted an investigation into the Plame leak, even after the President promised a "full investigation" to the public.
That kind of thing will bring you down all the way, quite possibly. Not on its own, but in conjuction with the tenor of the times (abuse of power), it can end the ability to lead, if not more.