This has been my summary argument for all leftist Bush-haters when they tell me it's just about oil, there's no evidence, etc....
When they admit that Blair and Bush are risking sooo much politically on this, I just ask them, "If Bush wants to be re-elected, and Blair is risking no-confidence, WHY IN THE WORLD would they risk this war, UNLESS they really have serious evidence????"
THAT is something they can never figger out!! It does not compute in their world, and they get stumped, because they cannot grasp a president doing something risky just because it's the right thing to do!