When the President brings piles of intel (insert joke here) that supports his need to jump to war, we believed him. After the intel he used to support his march to war was shown to be fabrications on their part or the sources, of course people will change their mind. Only a fool cannot change their mind, especially when the facts support the idea to do so.
Falling back on the fact that Saddam DID need to be taken out of power, isn't an option. If it is, then there are MANY more people that should be taken out of power as well. Iran's president is a known terrorist and yet he is in power. Africa is so full of examples, it's insane. North Korea has a whack job in power that's running his country into the ground. There are even more examples out there. Why does Dubbya's idea of spreading democracy stop only with Saddam, a man who his father wouldn't take out of power? Is it because he realized that'd put us as the world's police, like he and his cohorts were accusing Clinton of trying to do?
With that in mind, Dubbya is full of it. He can't apply the same reasoning to any other country, so it's voided his excuse. He couldn't even follow his own and other republicans "advice" to President Clinton when placing the US military into a full out war.
Clinton may have lied about a BJ to the world, which isn't a great thing to do. But Dubbya has lied to the world to commit our military to a poorly planned war and place them in a country as occupiers, which we are not trained to be. If you don't like him being called a liar, than let me sugar coat it for the republicans out there.... he knowingly used intel that was known to be questionable, and guess what? It WAS as bad as our intel community knew it was.