The fact that one more guy has called Mr. Bush a liar is no cause for headlines. It’s an everyday occurance. I’m afraid there’s no way to give a simple, quick answer to your question here in General Questions. Such a discussion would quickly get kneedeep in political anger. There are surely threads on this subject in other forums.
What, are you kidding? This debate has been raging throughout the United States all year long. There is no “straight dope” on it. Some people say Bush lied outright. Some people say he had poor intelligence and genuinely believed that there were WMD in Iraq at the time of the war. Some people say he was absolutely right, and that the WMD have just been concealed/moved/etc.