NEW YORK, March 15 (Reuters) - With hindsight, we may find that the 2016 U.S. presidential race began last week, when Hillary Rodham Clinton made a politically electrifying point. "Why extremists always focus on women remains a mystery to me," she said at the Women in the World conference in New York. "But they all seem to. It doesn't matter what country they're in or what religion they claim. They want to control women."