From the NY times

Senator Bernie Sanders of Vermont was reassessing the future of his presidential bid on Wednesday after a crushing round of primary losses left him with no realistic path to the Democratic nomination and the 2020 race itself looked increasingly dormant because of the coronavirus outbreak.

Mr. Sanders’s campaign has stopped actively advertising on Facebook and its campaign manager sent an email to supporters without asking for donations — the kind of steps that other candidates have taken before ending their campaigns. Mr. Sanders’s aides said he is not suspending his campaign at this point, even as some Democrats have become increasingly vocal that he should consider leaving the race.

Even among Democrats who view Mr. Biden’s eventual triumph as inevitable, there is a belief that contested primaries are good for the party, making some of them reluctant to call for Mr. Sanders to withdraw. In Wisconsin, Democratic officials worry that if Mr. Sanders drops out before the state’s planned April 7 primary, it could dampen his supporters’ enthusiasm, depress turnout and hurt progressive candidates for state and local offices.

Mr. Sanders also views the coronavirus crisis as a moment when the progressive agenda he has championed for years is especially vital, and he is eager to leverage his influence for good at a time when issues like health care and economic inequity are so resonant, some allies say.

And top advisers see potential for him to continue to shape the narrative around how the country should be responding to the crisis and are holding out hope that they can harness existing virtual infrastructure to allow him to get his message out and keep his supporters engaged — a tacit admission that the campaign is no longer trying to win.

The above paragraphs show that yes, Sanders knows his electoral situation is done for, despite never clearly indicating if he is dropping out.

Some suggested Mr. Sanders should declare a moral victory — Democrats have moved broadly toward his progressive policy platform since he began his first presidential campaign — and throw his support to Mr. Biden.

“It’s time to throw in the towel knowing that he has won the battle of issues,” said Wilbur Colom, a D.N.C. member from Mississippi. “The Democratic Party has moved within inches of his revolution on all major issues. We all are feeling the Bern.”

From the Star

Charles Chamberlain, chairman of the progressive group Democracy for America, said Sanders can play a potentially “critical” role in unifying the party by continuing his campaign.

“Bernie has already made it clear that he will 100% support the Democratic nominee and that he’s going to campaign for Joe Biden if that’s who it is,” Chamberlain said. “The reality is, that’s not 100% true for all Bernie Sanders supporters. So there is a real value to Bernie staying in the race as long as possible to bring those people into the party deeper.“

That underscores the sensitivity of how Sanders proceeds. Justin Bamberg, a South Carolina state representative and Sanders supporter, said it’s wrong to assume that, if the senator quickly drops out, his backers would unite behind Biden.

“It’s a mistake for the party, regardless of whether the nominee is Biden or Bernie, to think that beating Donald Trump in and of itself will be enough motivation for the average person living their day-to-day life to come out and be excited about voting in November,” Bamberg said.

I agree. Biden needs to emphasize that he can be trusted to keep his promises of endorsing and then carrying out Warren's plan despite their controversies and that the bernie or bust folks won't gain nothing from a Biden presidency.