Whatever else we may want to say about the system, we cannot shut our eyes to the fact that the voters of the liberal party in American politics twice had the opportunity to nominate Mr. Sanders as their candidate for president and twice declined to do so. If we don’t allow this to inform our understanding of the popularity of our politics, we’ll never move forward and start winning elections to gain more power in our system.

This may be seen as a betrayal of the socialist principles I stand for, which are at heart an insistence on the absolute moral equality of every person and a fierce commitment to fighting for the worst-off with whatever social and governmental means are necessary. But I am writing this precisely because I believe so deeply in those principles. I want socialism to win, and to do that, socialists must be ruthless with ourselves.

The idea that most Americans quietly agree with our positions is dangerous, because it leads to the kind of complacency that has dogged Democrats since the “emerging Democratic majority” myth became mainstream. Socialists can take some heart in public polling that shows Americans warming to the abstract idea of socialism. But “socialism” is an abstraction that means little without a winning candidate. And too much of this energy seems to stem from the echo-chamber quality of social media, as young socialists look at the world through Twitter and TikTok and see only the smiling faces of their own beliefs reflected back at them.