It is, as foreign policy expert Yogi Berra would put it, a case of "déjà vu all over again." But this time, the weapons of mass destruction menace is Iran. And the question for the Bush administration, struggling with a difficult and still-unfinished war of preemption against Iraq, is how to get it right the second time around. The best advice I've heard for dealing with Iran comes from former CIA analyst David Kay. He's the man who finally uncovered the truth about Iraq's weapons program -- namely that, contrary to the expectations of nearly every intelligence service, it had...