Gazing across what Zbigniew Brzezinski once called the “arc of crisis,” U.S. foreign policy appears to be disintegrating. On the Horn of Africa, Islamic warriors have seized Mogadishu. The warlords, our allies, are on the run. In Islamist Sudan, the Darfur horror rages on. In Egypt, Hosni Mubarak, whom our secretary of state was only recently snubbing for undemocratic behavior, now appears again to be persona grata as our only alternative to the Muslim Brotherhood. Yet the Egyptian president scarcely seems chastened. His judges just confirmed a five-year jail sentence for his democratic opponent Ayman Nur, and his regime just...