re: By design
It is interesting that in much of the right wing blogoverse and here, pro-Bush testimonials were taken as true without question, with no thought that maybe the people standing on the stage with him might have something to gain by it.
Those who come forward with anti-Bush testimony (e.g. Richard Clarke, O'Neil) are dragged through the mud, questioned on every detail, accused of having an axe to grind, political motives, or worse.
If I were you, I'd stand up and say "Guilty as charged".