Updated at 11:51 a.m. to include updated numbers from the campaign.

CLAREMONT, N.H. — Beto O'Rourke announced Wednesday that more than 128,000 donors contributed to his record-breaking first-day campaign haul of $6.1 million, an average of $48 per donation.

The former three-term El Paso congressman jumped into the presidential race last Thursday, and detractors had alleged that high-dollar donors rather than a grassroots outpouring may have padded his tally.

Sen. Bernie Sanders brought in $5.9 million during his first 24 hours last month from 223,047 donors, an average of $27.

Official fundraising tallies for them and their rivals for the 2020 Democratic nomination have not been filed. But these one-day tallies provide bragging rights and, in O'Rourke's case, put to rest doubts about whether he could harness the nationwide support he received for his Senate bid in Texas.

The Texan said he received 128,000 "unique donations," which could mean that some individuals donated multiple times.

Sanders is the only 2020 Democratic competitor who has come close to O'Rourke's torrid pace in the money chase. When O'Rourke eclipsed him, Sanders told his backers they should take comfort in the likelihood that he'd drawn support from more individuals.

Sen. Kamala Harris raised $1.5 million in her initial 24 hours as a presidential candidate. Others hit the $1 million mark after 48 hours.

O'Rourke smashed all fundraising records last year when he challenged Sen. Ted Cruz, bringing in $80 million — the most ever of any Senate nominee in any state.

Although O'Rourke fell short, he held Cruz below 51 percent, collected more votes than any Democrat ever has statewide in Texas, and generated national buzz that catapulted him into serious contention for the presidential nomination.

A CNN poll released Tuesday showed he is one of just four active or potential contenders polling in double digits.

The next campaign finance reports are due in mid-April, at which point it will become clear how much O'Rourke, Sanders and others relied on high-dollar donors. O'Rourke, for instance, could have reached his total with a thousand $2,800 donations — the current maximum — and 127,000 more donations averaging $26.