How should Democrats position their party to restore their catastrophic losses from the last eight years? The same factions from the 2016 primary have continued to slug it out, with the leftists arguing for more economic populism and the centrists arguing to stay the course. Now Sen. Kamala Harris (D-Calif.), a centrist darling, has taken up the major proposal of the left, by becoming a co-sponsor of Bernie Sanders' Medicare-for-all bill.