Carl Bernstein, who knows a little bit about White House scandals, has written a piece for Vanity Fair calling for investigation into the Bush presidency:

How much evidence is there to justify such action? Certainly enough to form a consensus around a national imperative: to learn what this president and his vice president knew and when they knew it; to determine what the Bush administration has done under the guise of national security; and to find out who did what, whether legal or illegal, unconstitutional or merely under the wire, in ignorance or incompetence or with good reason, while the administration barricaded itself behind the most Draconian secrecy and disingenuous information policies of the modern presidential era.

Bernstein goes on to make the inveitable Bush-to-Nixon comparison, ending his article with this cold historical reminder:

There was understandable reluctance in the Congress to begin a serious investigation of the Nixon presidency. Then there came a time when it was unavoidable. That time in the Bush presidency has arrived.

Ouch.  Read the whole thing.