WASHINGTON (AP) — No more rallies. No more door-knocking. And no more in-person fundraisers, raking in dollars from dozens of millionaires at once.

The coronavirus has disrupted American life, and the 2020 presidential campaign is no exception. Amid calls for social distancing to stop the pandemic's spread, President Donald Trump and Democrats Joe Biden and Bernie Sanders have had little choice but to call off large-scale public events in favor of politicking online and over the airwaves.

Gone are the rope lines, selfies with supporters and entourages of traveling press. They're being replaced — for now — with tools of the digital world: tele-town halls, virtual fundraisers and livestreamed speeches from candidates' homes, sometimes with awkward results.

The abrupt shift has infused the contest with an added degree of uncertainty.

With control of the White House at stake, candidates have been forced to ditch well-honed strategies in favor of untested tactics. There are doubts about whether they will be able to continue raising crucial cash as unemployment soars and the economy sputters. There are also concerns that a virtual campaign could foster the spread of misinformation and maybe even force the cancellation of the major party conventions this summer.

"Nobody's had to put together a general election strategy in the circumstances we face today," Anita Dunn, Biden's senior adviser, told The Associated Press. "I like to say every election is different. This election is really, really, really different."

Digital advertising and online outreach were always going to play a major role in the election. But no one could anticipate that tactile politics would be completely put on hold.

Since events halted earlier this month, Sanders has held a virtual rally featuring rocker Neil Young and appeared via livestream for a "fireside chat." But any momentum he's sought to build has been sapped, as Biden, the former vice president, has won a string of contests that put the nomination within his grasp.

Sanders' campaign did not respond to a request for comment.

The pause has provided Biden the opportunity to retool his campaign, which was running on fumes before his massive win in South Carolina last month reset the race. But he lacks the robust digital operation that Sanders and Trump have. And his early experiments in online campaigning have had mixed results.

Biden aimed to appear presidential during a livestream Tuesday night, when he won primaries in Florida, Illinois and Arizona. Standing before a podium with an austere backdrop from his home state of Delaware, he called on the nation to put politics aside to fight the coronavirus because it "doesn't care if you're a Democrat or a Republican."

Yet an earlier event was marred by technical glitches. At one point, Biden wandered off-camera. The campaign later apologized for the difficulties, and Rob Flaherty, Biden's digital director, acknowledged livestream technology is "one of the things that we're struggling with."

"He's the best retail politician in the entire world, right? So how do we build systems where he can go out and meet people, still talk to people, get those one-on-one engagements, and also make people feel like they're a part of something?" Flaherty said.

The campaign is also looking into adopting the use of Slack, a popular group communication platform, now that staffers are working from home.

Trump, too, is not immune from the effects. Though the Republican has the megaphone of the presidency, his dismissive early response to the virus and denials that a pandemic was spreading have been largely panned.

At the same time, he's being denied the ability to hold the freewheeling rallies that are a staple of his presidency and that allow him to blow off steam, attack rivals and often shift the media narrative.

As campaign offices have emptied out and workers telecommute from home, trainings for his reelection effort are now being done virtually, as are all voter contacts.

Tim Murtaugh, the communications director for Trump's reelection campaign, said the campaign is "best equipped" for the pivot to virtual campaigning. But no amount of technology can replicate the arena rallies that have served as mass organizing and communication events for his reelection.

Murtaugh said the campaign hopes to roll out "live and interactive" events with surrogates online in the coming days. Still, don't expect to see Trump participating in them.

Murtaugh said that as Trump and Vice President Mike Pence hold televised briefings daily, the campaign's role is to amplify their message.

"Americans want to see that their president and their government is on the case," he said.

While Biden has called for the country to come together for a moment of bipartisanship to address the crisis, other Democrats are itching to use Trump's handling of it as an election-year attack.

"Using Trump's own words and actions to remind people of his failures while he tries to rewrite history is essential," tweeted David Plouffe, Barack Obama's former campaign manager.

So far, at least, a political committee affiliated with Trump's reelection has opted against taking the same course. America First Action, a super PAC sanctioned by Trump, has postponed plans to spend millions attacking Biden in TV ads while the crisis in ongoing.

Another area of uncertainty is whether any of the contenders will still be able to rake in gobs of money, the lifeblood of any campaign.

With big-dollar events on hold, the candidates and the parties could struggle to bring in large checks. The financial uncertainty could also depress grassroots donations from those who give small amounts online.

"We have to be thoughtful about how we ask people for money," Flaherty said. "We're moving into a space where the economy is going to be tougher."

Not everyone is concerned, though.

"Any Democratic Party official who's agonizing over what type of fundraising we do or what type of convention we're going to have should get out of group therapy, go to JoeBiden.com and make a donation," said Robert Zimmerman, a prominent New York donor and Democratic National Committee member who said he would be fine casting his ballot for Biden during a virtual convention. "The pandemic that we're facing and the threat it represents puts everything in the proper perspective."

But it's not just the presidential candidates who will have to grapple with this new reality. Down-ballot candidates could find the shift to an all-digital campaign particularly challenging because many of them are running on much thinner budgets and have less money to spend on ads and staff to make up for the loss of in-person interaction.

"If you have no money, and you're dependent on meeting people out in organic environments, the challenges you now face are huge," said Kelly Dietrich, CEO of the National Democratic Training Committee, a group that trains Democrats who want to run for office or work on a campaign.

Even well-funded players in the presidential race are feeling the pinch. And the holding pattern gripping the contest is delaying on-the-ground organizing efforts that will be key to winning battleground states like Michigan, Pennsylvania, Wisconsin and Florida.

"Everyone is hitting pause and thinking about how we engage in field activities and organizing. Hopefully we'll get to a place where that can happen," said Guy Cecil, chairman of Priorities USA, the largest outside Democratic group. "But the reality is that until we see changes, we're just going to have to put those things on hold."

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Associated Press writer Bill Barrow contributed to this report from Atlanta.

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