The murder by Islamist terrorists of Ambassador J. Christopher Stevens and three other Americans in Libya on the anniversary of the Sept. 11 attacks has become one of the most contentious issues in the election. The administration has been flailing around, unsure of its facts, offering statements that turned out to be misleading. Republicans, led by Senator John McCain, have jumped on the errors by the State Department and the CIA that contributed to the confusion over our understanding of the slaughter in Benghazi, and backed an unrelenting press campaign attempting to show Barack Obama as either incompetent, a liar, or both.