I'm saying that based on the best intel he had, which matched the intel and opinion of darn near the world, he was NOT lying.
In the first place, the intelligence "he had" was not the same as that of the rest of the world. In fact, as has been clearly demonstrated through the investigative reporting done by Seymour Hersch published in New Yorker magazine, the Vice President opened something called The Office of Special Plans, through which raw intelligence was funneled, to circumvent the kind of analysis done by the CIA. The problem, as the administration understood it, was that the intelligence just wasn't providing the kind of information they could take to the American people to justify going to war. Rather than use the analytical tools and talents available at the CIA, naked reports were picked up and used, sometimes verbatim, by Bush, Cheney, and the rest, to bolster their case. The frustration at the CIA was so high partly because their imprimatur was being placed upon information that, time and again, proved (to put it judiciously) unreliable.
This brings up the larger point of the uses on intelligence. No nation uses intelligence for strategic purposes. Intelligence is a tactical tool, giving nations information on how best to pursue strategic goals. The only counter-example from history is the infamous Zimmerman Telegram just before the American entry into the First World War. The German ambassador to Mexico attempted to convince the Mexican government to declare war on the United States (we had just fought an on-again/off-again undeclared war against Mexico, from 1911 to 1915), and Germany would support the Mexicans by recognizing Mexican sovereignty over former Mexican territory in Texas, the southwest, and California. The telegram was released, even though it gave notice that we had broken German codes, as a great propaganda tool against the Germans who were, at the same time they were inciting the Mexicans to war, waging a peace offensive against the United States.
Governments seeking to make a case for war do not hide behind intelligence reports they insist cannot be revealed (unless, of course, they are tyrannical or criminal regimes). Their case is made public, and the information - even some which might otherwise be better kept classified - is revealed. To say that Bush was relying upon intelligence in his decision to go to war misconstrues the way intelligence works.
