Whatever you think of Sen. Bernie Sanders (I-VT), the frumpy Vermont senator deserves credit for expanding the substantive ambition of the Democratic presidential field. Sanders’ unexpectedly strong 2016 primary campaign proved that there is a hunger for big ideas like Medicare for All within the Democratic electorate, and it’s now likely that whoever the 2020 Democratic nominee is, they will support some form of universal single-payer health care.
Yet, for all of Sander...