But increasingly, what top Democrats appear to be saying is: Maybe he should.

The shift in tone is subtle, but it’s telling. These Democrats have increasingly treated this as a real possibility in ways you avoid if the name of the game is to batten down the hatches and stand by your man. And this is not coming from pundits, editorial boards or backbenchers; it’s coming from party graybeards and potential leaders.

In the aftermath of Thursday’s debate performance from Biden, former House speaker Nancy Pelosi (D-Calif.) defended him. “We see Joe Biden up close; we know how attuned he is to the issues, how informed he is,” she said Sunday on CNN. She added: “It was a bad night. Let’s move on from that.”

But on Tuesday, Pelosi called it a “legitimate question to say is [Biden’s debate performance] an episode or is this a condition” — saying the same of Donald Trump, for good measure — and suggested this was a conversation Democrats needed to have.

“This is not a normal election where you want to win — if you don’t, you cooperate and do the best you can for the country and hope to win the next time,” Pelosi said on MSNBC. “This is something that is undermining our democracy. [Trump] must be stopped. He cannot be president. Therefore, people are very concerned.”

Pelosi added: “It’s going to be up to Joe Biden to do what he thinks is — there’s no more patriotic person in our country than this president of the United States. Nobody less than the former president. But Joe Biden — and so I trust his judgment.”

Rep. James E. Clyburn (R-S.C.), who until recently served as the No. 3 House Democratic leader, went even further in entertaining the scenario.

“Now, Joe Biden may decide otherwise [and drop out],” Clyburn said on MSNBC. “But I think the people that I’ve been around the last three days are dug in, in their support for Joe Biden.”

Clyburn even added that, should Biden drop out, the party should go with Vice President Harris as its replacement.

“I will support her if he were to step aside,” Clyburn said, while emphasizing he wants a Biden-Harris ticket. He added: “No, this party should not, in any way, do anything to work around Miss Harris. We should do everything we can to bolster her, whether she’s in second place or at the top of the ticket.”

Kentucky Gov. Andy Beshear (D), one of those speculated on as a possible replacement, went on CNN on Tuesday night and also treated this as an open question.

“Well, Joe Biden is our nominee, and ultimately that decision on continuing or not will fall to him and his family,” Beshear said. “But I don’t think that there’s anything wrong with asking the president to talk to the American people a little bit more about his health or that debate performance.”

Illinois Gov. J.B. Pritzker (D), another talked-about presidential contender, also seemed to choose his words carefully Tuesday night on CNN.

“Look, right now, Joe Biden is our nominee,” Pritzker said. “And I’m 100 percent on board with supporting him as our nominee, unless he makes some other decision. And then I think we’re all going to be discussing what’s the best way forward.”

Pritzker even entertained alternatives like Harris, asserting that they could have broad appeal.

“I know there are people in the party that want people to just be quiet,” he said. “But the truth is I think people need to express themselves. We’re a party that accepts that. And I’m pleased about that. And then, we’ll come to a conclusion here. Joe Biden will come to a conclusion about it.”

He added: “Right now, unless he makes some other decision, discussing what’s the best way forward, Joe Biden will come to a conclusion about it.”

These are not the kinds of things you say if this isn’t something you want Biden to at least think about. And they are a marked contrast to the Biden campaign’s line that this just isn’t a consideration at all.

These Democrats are careful to caveat their comments by citing Trump and saying they stand by and support Biden if he stays. But these experienced politicians know those comments will only feed questions about whether Biden can or should continue. You don’t entertain those questions unless you think it’s a vital conversation, because the conversation itself could damage Biden by elevating these concerns.

At least for now, they’re keeping that conversation going. And the Biden campaign’s efforts to tamp it down aren’t working.