"The road of isolationism and protectionism may seem broad and inviting, yet it ends in danger and decline," railed President Bush in his State of the Union. Again and again, Bush returned to his theme. "America rejects the false comfort of isolationism. ... "Isolationism would not only tie our hands in fighting enemies, it would keep us from helping our friends in desperate need. ... "American leaders from Roosevelt to Truman to Kennedy to Reagan rejected isolation and retreat." Why would a president use his State of the Union to lash out at a school of foreign policy thought that...