Two weeks after Ambassador Chris Stevens and three other Americans were murdered in Benghazi, Libya, the Obama administration has conceded it was an act of terrorism. The attack on the U.S. Consulate, Secretary of State Hillary Clinton now admits, was part of a broader effort by al-Qaida in the Islamic Maghreb, working "with other violent extremists to undermine the democratic transitions under way in North Africa, as we tragically saw in Benghazi." Yet 10 days ago, U.S. Ambassador to the U.N. Susan Rice was trotted out on every Sunday talk show to blame the massacre on a mob inflamed by...