From the 2016 platform :
Securing Universal Health Care
Democrats believe that health care is a right, not a privilege, and our health care system should
put people before profits.
Thanks to the hard work of President Obama and Democrats in
Congress, we took a critically important step toward the goal of universal health care by passing
the Affordable Care Act, which has covered 20 million more Americans and ensured millions
more will never be denied coverage because of a pre-existing condition. Democrats will never
falter in our generations-long fight to guarantee health care as a fundamental right for every
American. As part of that guarantee, Americans should be able to access public coverage through
a public option, and those over 55 should be able to opt in to Medicare. Democrats will empower
the states, which are the true laboratories of democracy, to use innovation waivers under the
ACA to develop unique locally tailored approaches to health coverage. This will include
removing barriers to states which seek to experiment with plans to ensure universal health care to
every person in their state. By contrast, Donald Trump wants to repeal the ACA, leaving tens of
millions of Americans without coverage.
You can find the whole document online.