LAS VEGAS (AP) — Democratic voters appear to be reassessing their approach to health care, a pragmatic shift on their party's top 2020 issue. "Medicare for All" remains hugely popular, but majorities say they'd prefer building on "Obamacare" to expand coverage instead of a new government program that replaces America's mix of private and public insurance. Highlighted by a recent national poll, shifting views are echoed in interviews with voters and the evolving positions of Democratic presidential candidates on a proposal that months ago seemed to have growing momentum within their party.Read more on NewsOK.com