When Bernie Sanders has a bad policy to sell, he comes to California. In 2017, the socialist firebrand, fresh from his defeat in the Democratic presidential primary the year before, rallied nurses for “Medicare for All” at a large demonstration in San Francisco. Never mind that Sanders’ home state of Vermont abandoned its own version of “Medicare for All.” In 2011, when Vermont launched its single-payer system, called “Green Mountain Care,” it had strong political support from the state’s