from The Wall Street Journal
The news media would do well to keep in mind that once we report something, some people will always believe it even if we try to stuff the genie back in the bottle. For instance, six months after the invasion, one-third of Americans believed WMDs had been found, even though every such tentative claim was discomfirmed. The findings also offer Machiavellian possibilities for politicians. They can make a false claim that helps their cause, contritely retract it -- and rest assured that some people will nevertheless keep thinking of it as true.