From Paul Krugman's column in the NYT titled "Reign of Error"

Amid everything else that’s going wrong in the world, here’s one more piece of depressing news: a few days ago the Harris Poll reported that 50 percent of Americans now believe that Iraq had weapons of mass destruction when we invaded, up from 36 percent in February 2005. Meanwhile, 64 percent still believe that Saddam had strong links with Al Qaeda.

At one level, this shouldn’t be all that surprising. The people now running America never accept inconvenient truths. Long after facts they don’t like have been established, whether it’s the absence of any wrongdoing by the Clintons in the Whitewater affair or the absence of W.M.D. in Iraq, the propaganda machine that supports the current administration is still at work, seeking to flush those facts down the memory hole.

But it’s dismaying to realize that the machine remains so effective.
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It’s all very Orwellian, of course. But when Orwell wrote of “a nightmare world in which the Leader, or some ruling clique, controls not only the future but the past,” he was thinking of totalitarian states. Who would have imagined that history would prove so easy to rewrite in a democratic nation with a free press?