Hillary Clinton showed more signs of flexibility Wednesday on how Obamacare is implemented, but she insisted the law is too important to “turn the clock back.” In a question-and-answer session following a lecture at UCLA, Clinton suggested she’s open to different ways of achieving the health law’s goals. She praised Arkansas — the state where she and her husband rose to political fame — for carrying out a new approach to expanding Medicaid coverage, by using the federal money to buy private health insurance for more than 100,000 low-income residents. Clinton called the move, spearheaded by Democratic Gov. Mike Beebe...