FOR the decade since its founding by the neoconservative thinker Irving Kristol, The National Interest has been a central forum for the most influential conservative foreign policy thinkers of all stripes to hash out their differences. It launched ideas that entered the public policy vernacular, like "the end of history," "the West and the rest," and "geo-economics," and for the last six months it has played host to a closely watched intramural conservative debate over the wisdom of the war in Iraq. Now, however, a philosophical disagreement within its editorial board has put its future in turmoil. On Friday, 10...