ON JUNE12, 2003, when he first published a story about the matter, Washington Post reporter Walter Pincus became the second journalist to have been used by Ambassador Joseph Wilson to peddle bogus information about his February 2002 trip to Niger. Wilson told Pincus that he had debunked Bush administration claims that Iraq had sought uranium from Niger. He was specific and apparently seemed credible. And Pincus bought it all. He wrote: Armed with information purportedly showing that Iraqi officials had been seeking to buy uranium in Niger one or two years earlier, the CIA in early February 2002 dispatched a...