Democratic presidential hopeful Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) announced Thursday that his campaign has garnered more than 1 million individual donors, making him the first candidate to claim to have hit the milestone.

“With 1 million contributors, this is the only Democratic campaign that has more supporters than Donald Trump,” Sanders campaign manager Faiz Shakir said in a statement.

“Our strength is in numbers, and that is why Bernie Sanders is the only candidate who is able to say his campaign will rely only on grassroots funding in both the primary and against Donald Trump. Like all campaigns we are beholden to our donors, and we’re proud to stand with one million working people."

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The campaign declared Sanders the fastest candidate in history to reach the milestone and said 99.5 percent of its donors are eligible to donate again since they have yet to reach the maximum donation amount.

Starbucks, Walmart and Amazon are the most common employers of individuals who have donated to the senator's White House bid, while teachers remain the top occupation, his campaign said.

The 2.5 million overall donations have come in from all 50 states, the District of Columbia and Puerto Rico, while more than 125,000 donors make monthly recurring contributions, according to figures released by his staff.

Sanders is seeking to shore up support for his campaign following weeks of rising polling figures for Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.), the other top progressive in the Democratic primary who has overtaken him in the Real Clear Politics polling index.

Both candidates still trail former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE in most national and statewide polls, though Biden's lead in several polls has become narrower.

Seeking to dismiss concerns over Sanders’s electability, his campaign noted Thursday that it has attracted 81,000 donations from counties that flipped from former President Obama in 2012 to President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE in 2016.

Sanders has cultivated a loyal grassroots following since his 2016 insurgent presidential bid against Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE, the eventual Democratic nominee that year, helping ensure he will have the runway to compete far into the party's 2020 nominating contest.