On Wednesday, Joe Lieberman wrote on this page that the Democratic Party he and I grew up in has drifted far from the foreign policy espoused by Franklin Roosevelt, Harry Truman and John Kennedy. In fact, it is the policies that President George W. Bush has pursued, and that John McCain would continue, that are divorced from that great tradition – and from the legacy of Republican presidents like Ronald Reagan and George H.W. Bush. Sen. Lieberman is right: 9/11 was a pivotal moment. History will judge Mr. Bush's reaction less for the mistakes he made than for the opportunities...