AdvertisementAnalysisHere Are The 'Outside The Box' Progressive Ideas 2020 Democrats Are PitchingPlay03:52Download AudioDecember 14, 2018Danielle Kurtzleben facebookEmailSen. Elizabeth Warren, a Democrat from Massachusetts (center), is just one of several potential 2020 presidential candidates who came out in support of Sanders' Medicare for All proposal in 2017. (Bloomberg via Getty Images)