I will not let [President Bush] off the hook throughout this campaign with respect to America's credibility," said John Kerry last June in New Hampshire, a theme he has repeated over and over. Now that the "big mo" in the Democratic primary has clearly shifted to the Massachusetts Senator, it is time for his opponents and the media to start asking about Kerry's own credibility on the question of intelligence. A good place to start is with the fate of TWA Flight 800, the plane that was alleged to have self-destructed off the coast of Long Island in 1996 with...