Though the coronavirus pandemic has dramatically altered everyday life in America, the business of primary politics hasn’t shut down—and could last long past Tuesday’s three contests. Though Joe Biden holds robust polling leads in Florida, Arizona, and Illinois, and Bernie Sanders’ path to the nomination appears increasingly grim, the Vermont progressive has signaled that he is unlikely to drop his 2020 bid just yet. “I want the senator to stay in,” Nina Turner, a national co-chair of the Sanders campaign, told the New York Times on Monday. “I think other voters have a right to have a choice. This is not a coronation. We know what happened last time in 2016—it gave us Donald J. Trump.”

After Biden’s most recent string of wins, including in Michigan, Sanders struck a somewhat more conciliatory tone, acknowledging his campaign’s perilous position and calling on the Democratic establishment to “speak to the issues of concern” to younger voters who represent the future of the party. But he also said he looked forward to debating Biden, and, after a jovial elbow-bump greeting on stage Sunday night, he clashed with the frontrunner in a way that suggested he’s not ready to bow to Biden’s call for party unity just yet. That could be because he hopes to force conversations about his campaign’s progressive principles for as long as possible. “What I know about Sen. Sanders’ thought process and focus is, it’s all about representing the movement and leading what he initially called the political revolution,” Kurt Ehrenberg, Sanders’ longtime political strategist in New Hampshire until last year, told Politico. “And not letting down the people who have been with him all along. I think that’s the most important consideration for him.”

But some in Sanders’ camp have urged him to stay in the race because they still see a potential avenue to victory. “I don’t think anyone can predict for sure what’s going to happen between now and the end of this primary contest,” Charles Chamberlain, chairman of the Democracy for America political action committee, told Politico, suggesting Sanders could nab the nomination at a brokered convention should neither candidate reach the delegate threshold outright. “There’s plenty of time, plenty of delegates left, and this game can change at any minute.”

Heading into Tuesday’s primaries, Biden outpaced Sanders in pledged delegates, 898 to 745. Conceivably, that’s not necessarily an insurmountable lead. But Biden also has an undeniable momentum, leading his rival by almost 25 points in an average of national polls and in recent polls of upcoming primary states. Wins on Tuesday could extend Biden’s lead, giving an added air of inevitability to his nomination, and perhaps turning the polls even more in his favor. Should that happen, calls for Sanders to drop his bid and help unite the party ahead of a high-stakes general election against Trump. “The chance of getting the nomination is so tiny, the stakes are so high given Trump and coronavirus and the economic fallout, that he does need to face that reality,” former Labor Secretary Robert Reich, a Sanders supporter, told the Times.

The big question mark at the moment is coronavirus, which has already complicated the primary. Several states, including Ohio, which had originally been scheduled to vote Tuesday, postponed their elections. Those states that are going forth with their elections Tuesday have had to deal with changes to polling locations, including some closures, and drops in election judges. In Chicago, America’s third largest city, officials on the eve of the primary were still begging for young, healthy individuals to volunteer to work the polls — and suggested they may “deputize added judges on the spot if needed,” according to NBC Chicago. “Help us,” Chicago Board of Elections chair Marisel Hernandez said in a news conference Monday.