Finally

At least 300 Bernie Sanders delegates are threatening to vote against the platform if support for Medicare for All is not included in the platform.

Good. To quote XTC, "People will always be tempted to wipe their feet, On anything with 'welcome' written on it."

A revolt is brewing among Bernie Sanders delegates three weeks from the Democratic National Convention.

More than 360 delegates, most of whom back Sanders, have signed on to a pledge to vote against the Democratic Party’s platform if it does not include support for "Medicare for All," the petition’s organizers told POLITICO. They argue that single-payer health care is an urgent priority amid a worldwide pandemic and the biggest unemployment crisis since the Great Depression.

“This pandemic has shown us that our private health insurance system does not work for the American people. Millions of people have lost their jobs and their health care at the same time,” said Judith Whitmer, a Sanders delegate and chair of the convention’s Nevada delegation who helped spearhead the pledge. “There’s people leaving the hospital now with millions of dollars in medical bills. What are we going to do about that?”

Good.  It's rational to make this a fight on principle.

First, taking a stand on principles helps the progressives' long game, and second, a fight over this at the convention, even if it is a sparsely attended remote event, is just the sort of flash that the press loves to cover.