@mysteryman,
Basically what you're doing is deliberately conflating common knowledge with a widely held belief in order to make a cheap rhetorical stunt. This isn't the first time you've dug up an old post of mine for some weird reason of yours.
By using the rule of three, and deciding on your own definition of 'common knowledge,' you're doing something very simple and ultimately meaningless. Why did it take you so long?
Here's a similar example,
It's common knowledge there were no WMDS in Iraq.
It's common knowledge Reagan was giving arms to the Contras
It's common knowledge Sir Jimmy Savile OBE was a predatory paedophile.
Common knowledge tends to be bang on.
The reason I don't waste my time posting endless links to something that is common knowledge when debating with extreme right wing Americans, is because they've swallowed so much far right propaganda they view the truth and facts as socialist, so any source no matter how reputable will be branded hysterically left wing. With regard to Bush being warned by the Clinton admin about Al Qaida, Infra Blue has already posted a link. Now you can blame the success of 9/11 on the ingenuity of Al Qaida, but the fact that a complete muppet was sitting in the Whitehouse at the time was the main reason it happened. Nothing like it happened under Clinton or Obama.