I'm one of the few here that has a problem with the results so far. If there are no WMDs and President Bush was aware then he joins LBJ and the Tonkin Gulf, FDR and the deliberate misrepresentations of U Boat attacks on American ships in the fall of 1941, and Nixon's " Iam not a crook..." On the other hand if he was not aware, then something is very wrong with our intel, and in a world such as we live in today that fact is unacceptable.
If the WMDs are found, GREAT. If not than we have some trouble.
I think that political considerations could certainly play a part in the timing of the release of information, especially when the best course of action is debatable. For instance, there might be some positives to releasing some information early (strengthing our bargaining position in debates over control of Iraq, easing domestic political pressure on Blair, sending a message to other rogue nations) and their might be some negatives (exposing intelligence methods, increasing the risk that the WMDs might themselves becoming tempting terrorist targets, risking other potential finds.)
At that point, I think political considerations would inevitably be included in the equation.