Polling suggests that the more people learn about the cost and bureaucracy likely to result from a government-run health system, the less they favor it. So naturally Sen. Bernie Sanders of Vermont has decided to make his plan for a government-run health system bigger and more expensive.

This column recently noted that Mr. Sanders is the kind of socialist who demands $32.6 trillion from taxpayers to alter their medical care and then misleads them about the imagined benefits. But that description now seems unfair since the 2020...