US Democratic presidential nominee Joe Biden and his party raised a record-shattering US$383 million (S$519 million) in September for his presidential bid, likely bolstering his financial advantage over President Donald Trump ahead of the Nov 3 election.
The campaign had US$432 million in cash at month's end for the final five weeks of the race, campaign manager Jen O'Malley Dillon said on Twitter.
The haul outstripped the US$365 million that Democrats raised in August, which was itself a monthly record for any US presidential campaign.
"To every person who chipped in a few dollars the previous monththank you," Mr Biden wrote on Twitter in announcing the sum.
"I'm incredibly humbled." Mr Biden has held a significant lead over Mr Trump in national polls for months, although Reuters/Ipsos polling shows a somewhat closer race in the battleground states likely to decide the winner.
The Trump campaign has not yet announced its September total, but it pulled in US$210 million in August along with the Republican National Committee. As of Aug 31, Democrats had US$466 million available to spend on the presidential race, compared with US$325 million for Republicans.
The latest figures cap a stunning turnaround for the Biden campaign, which emerged from a crowded Democratic primary field earlier this year with little cash.
The Trump campaign, which began raising money nearly as soon as he took office in 2017, had once appeared to be a financial juggernaut.
But Democratic voters' intense desire to defeat Trump's re-election campaign has driven a wave of donations up and down the ballot.
The Sept 18 death of US Supreme Court Justice Ruth Bader Ginsburg, a liberal icon, and Trump's subsequent nomination of conservative jurist Amy Coney Barrett prompted a fresh surge.
ActBlue, the leading Democratic fundraising website, has processed more than US$780 million in contributions in the 26 days since Ginsburg's passing.
Ms O'Malley Dillon said US$203 million of the campaign's total came from online donors.
The results of Mr Biden's fundraising power were on display in September, when he ran nearly US$148 million in advertisements on television and radio, while Mr Trump's spending was less than US$56 million, according to Advertising Analytics LLC, a market research company.
Mr Biden's campaign has sought to use his edges in polling and money to expand the electoral map, running ads in states like Ohio and Iowa that were once thought to be out of reach.