This is either an incredible act of despiration or the product of shallow thinking.
When the troops go in, they will find WMD and other stuff. It will be the type things the Dems will have learned about in security briefings, but acted like didn't exist. They are setting themselves up for election defeat unlike anything they have ever seen.
"Had Bush not scared poor little harmless, peace-loving Saddam with his axis-of-evil rhetoric, Iraq wouldn't need Weapons of Mass Destruction...so it's Bush's fault!", they'll say ;^)