At a minimum they've been unknowingly lying, sticking to it after they've been proven wrong, and not apologizing or taking any responsibility for their mistakes. The US commissions from the start were forbidden from declaring any wrongdoing by the White House as being outside their area of investigation, and the British commissions reviewed condemning evidence already available to the public and managed to find that it didn't actually condemn anyone, not even a low level scapegoat. How bad does it have to get before you'll stop supporting an administration that invaded the wrong country at the behest of a declared enemy? Does Bush have to commit adultery or merely join the Democratic Party and suddenly, all else equal, you won't support him anymore?