President Obama continues to alter his signature promise in selling the Affordable Care Act back in 2009 and 2010. "If you like your plan, you can keep your plan," he said back then. But that simple pledge has had to change as the Affordable Care Act has been implemented and a small percentage of Americans, albeit millions of people, have received cancellation notices from their insurance companies. And for the second time in two weeks, he's tweaked the line. When President Obama spoke Monday night to a group of supporters, he said: "While virtually every insurer is offering new, better...