That clearly was the intent of White House Deputy Chief of Staff Karl Rove in leaking to a reporter that former Ambassador Joseph C. Wilson IV's wife, Valerie Plame, was a CIA agent. To try to conceal the fact that the president had lied to the American public about Iraq's weapons of mass destruction program, Rove attempted to destroy the credibility of two national security veterans and send an intimidating message to any other government officials preparing to publicly tell the truth. Rove's lawyer now says that Rove didn't break the law against naming covert agents because he didn't know...