The presumed date by which Biden’s delegate nerds predicted Bernie Sanders would be unofficially knocked out of the race has been upended by a series of canceled primaries. Biden had planned to use a predicted victory in Georgia on Tuesday to essentially end the race by declaring that he had achieved “an insurmountable delegate lead.”

Instead, the Georgia primary was moved to May and Biden retreated to a makeshift studio in his basement at home in Delaware to broadcast Zoom videos that have had to compete — poorly, so far — with briefings from elected officials like Trump and Gov. Andrew Cuomo, who are actually responsible for dealing with the crisis.

“Everything that's happening right now is like nothing I've experienced in previous presidential campaigns,” said Dunn.

The first big political issue is whether the Sanders campaign has any chance of returning from the dead. With many remaining primaries getting kicked to May and June, Biden might not be able to deliver his “insurmountable delegate lead” line until the summer. And while the pandemic has essentially erased Sanders from the news, there is an undercurrent of frustration — and a little nervousness — among some Biden aides that he has been robbed of a clean victory as the presumptive nominee at the end of March, as they had assumed he would. “There’s no closure,” said a top Biden adviser.

The pandemic exploded and inserted itself as the only issue that matters just as Biden made his remarkable transition from lost cause to incredible comeback. The rebound was so swift and his dominance over the race so sudden, that a lot of Biden advisers and outside allies are still processing what happened. Did Biden build an excellent team that just took some time to get things right? Or was Biden’s team hapless and he was simply the beneficiary of underlying dynamics in the primary that allowed him to beat Sanders?

The latter view was expressed by an informal adviser to the campaign.

“After Super Tuesday, Biden got catapulted to the front of the line in spite of himself and his campaign,” he said. “The classic example of that obviously is Massachusetts, where he never went there, didn’t spend any money, didn’t have any people on the ground, and he beat Elizabeth Warren and Bernie Sanders. It’s extraordinary. And there’s a reason for it: Democratic voters were saying that the most important thing to them is to beat Trump and he was happy to be the beneficiary of that. But perhaps many of us were overly critical of how they ran the campaign and, frankly, how he performed. He has some fundamental strengths that those of us watching this undervalued.”

Biden clearly agreed that some version of this analysis was accurate: He replaced his campaign manager on March 12, after a string of victories made it clear he would be the nominee. Jen O’Malley Dillon, the new manager, started at the time the pandemic exploded and the campaign became virtual.