April 23, 2014, 6:43 PM ET Hillary Clinton Again Calls Benghazi ‘Biggest Regret’ as Secretary of State BOSTON – Hillary Clinton reiterated Wednesday that her darkest time as secretary of state was the deadly 2012 attack on the U.S. consulate in Benghazi, Libya. Mrs. Clinton, in a speech to more than 3,000 people at a women’s leadership conference here, called the attack and loss of lives “very, very painful” and “certainly the biggest regret that I have as secretary of state.” She noted that she had taken responsibility for security at the diplomatic outpost, where Ambassador Christopher Stevens and three...