I would be somewhat surprised if Tenet really came out against Bush for a few reasons.
First, Bush was the guy who stood in the gap when everyone wanted Tenet strung up.
Second, Tenet really knows how much shennigans (sp?) has been played by the democrats over 9/11, Afghanistan, and Iraq. He has seen the visceral hate for the administration and how it has gone well over the bounds of "normal" politics.
Third, he knows the threat to this country is real peril from terrorism. The dems are talking internationalization and all the UN stuff, which Tenet has seen, first hand, does not work.
So, I would be quite disappointed in Director Tenet if he were to start shilling, though, admittedly, I would only be somewhat surprised not entirely surprised.
The election would be this year. McCain would make sure that a Republican won the seat. No doubt in my mind. It would be a slam dunk.