We won’t rehearse the familiar points about Medicare for All: it’s good, it’s needed, it’s what the people want — as Fox News recently found out the hard way.

But Medicare for All is more than just a matter of fixing our broken health-care system. And it’s more than just a good policy. It’s the perfect fight to pick with our ruling class — one that can unlock the power of a mass, working-class movement in the United States.

We don’t believe this because we think health care is somehow naturally more important than other issues. On moral grounds, it’s hard to find an injustice more tragic than migrant detention camps, and we could be convinced that any number of causes are more morally urgent than Medicare for All. On scientific grounds, the imminent threat of climate disaster is surely the most pressing issue, not just for the Left but for humanity as a whole. But on political grounds, if we want to take the nascent left renaissance in America and turn it into a durable, working-class movement in the 2020s — a precondition for addressing more morally and more scientifically urgent issues of the day — the fight for Medicare for All must be at the very top of the Left’s priorities.