<p>Hillary Clinton hit back at Bernie Sanders' call for single-payer health care, invoking her past work on the issue as proof that it would not be a viable policy solution.</p><p>“The revolution never came. I waited, and I’ve got the scars to show for it," Clinton said, a reference to failed "Hillarycare" efforts to get universal health care reform passed in the 1990s, as well as Sanders' repeated calls for a political "revolution" to unite the middle class under a common cause.</p><p>"I don’t think we should have to be defending it among Democrats," she said of the 2010 Affordable Care Act, remarking that others in her party should be working to improve the legislation instead.</p><br>