Re: the Time poll:

There's yet a another possibility not examined by the poll: Bush was completely truthful--based on the intelligence given to him---but he made damn sure that he would only see intelligence which would support his predetermined decision to invade Iraq.

All intelligence contrary to this idea was extremely strongly discouraged--as a result--mirabile dictu-- none of it ever made it to him. And he never had anybody investigate the intelligence supporting the decision to invade--to check its reliability.

And now he can even preserve deniability.

I consider this actually to be the most likely course of events.