Joseph R. Biden Jr. and the Democratic National Committee had, by far, their biggest fund-raising month of the campaign in May, pulling in $80.8 million as large and small donors alike consolidated behind the presumptive Democratic nominee ahead of his fall contest with President Trump.
Mr. Biden had struggled with fund-raising throughout much of the primary season, but the pace of giving has sharply increased in recent months.
“I’m in awe of this sum of money,” Mr. Biden wrote in a note to supporters, announcing the figures.
The May haul was more than 30 percent higher than the $60.5 million that Mr. Biden and the party had raised in April, when Mr. Trump and the Republican National Committee raised $61.7 million. Mr. Trump’s campaign has not released figures for May yet.
Notably, May was also the first full month that Mr. Biden had an agreement to raise money in tandem with the D.N.C. through what is known as the Biden Victory Fund, which allows a single donor to give more than $620,000. Mr. Trump has been raising money in such large chunks for many months.
Mr. Biden’s campaign sought to highlight the role of small contributors in its growing fund-raising operation, noting that the campaign had tripled its number of online donors since February, and that more than half of the contributors last month were new to the campaign.
Mr. Biden began May with a fund-raising event held by alumni of the Obama administration that raised $1 million, and followed that with a series of high-dollar virtual fund-raisers held via Zoom.
The hosts of fund-raisers last month included Hillary Clinton; Gov. Gavin Newsom of California; David Cohen, a senior executive at Comcast who also hosted Mr. Biden’s first event the day he announced his candidacy in 2019; Senator Cory Booker of New Jersey; and Pete Buttigieg, another former 2020 rival.
Two potential running mates for Mr. Biden also headlined events in May: Senator Tammy Duckworth of Illinois and Representative Val Demings of Florida, whose event was attended by Mr. Biden’s wife, Jill Biden.
This spring, the Biden campaign named Rufus Gifford, who served as finance director on President Barack Obama’s re-election campaign, as deputy campaign manager, a decision seen as elevating the role of the finance operation inside the campaign.