One of the strangest features of the contemporary political landscape is the convergence everywhere of the Left with Muslim jihadis and extremists. Those who once protested against the installation of cruise missiles in Western Europe, say, now demonstrate against the war on terror. Those who praised the Soviet Union as peace-loving are now busy signing petitions and publishing articles to the effect that Iran's nuclear program and nuclear weapons (if it comes to that) are a third-world success and nothing to worry about. Anti-Americanism has made bedfellows of people whose world views and values are ostensibly incompatible. David Horowitz was...