There are a lot of hard feelings on the Left these days. Leaving aside the particular distortions of the Twitter world, where 280 characters often lend themselves to substanceless snark and woker-than-thou point scoring rather than healthy debate, left squabbling seems to be increasing on social media and in real life — a potential sign of disarray within our movement.

Socialists were riding high at the end of February. A political reality that most of us thought inconceivable a few years ago, or even a few months ago, seemed possible, even probable. Bernie Sanders had just swept the Nevada caucus, having already won the popular vote in Iowa and New Hampshire. A democratic socialist was the front-runner to win the Democratic nomination. Could the White House actually turn Red?

Instead, this series of events followed. With the help of a united Democratic establishment and media, Joe Biden resurrected his listless campaign. Bernie’s campaign and other left organizations were not yet strong enough or rooted enough to mobilize voters on the scale we needed to counter Biden’s advance.