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's (I-Vt.) presidential campaign announced on Tuesday that it has reached 4 million individual donations.

“Working-class Americans across the country are chipping in $3, $18, $27, or whatever they can to help elect Bernie Sanders because they know he is the only candidate who will fight for them and take on corporate greed and corruption,” Sanders campaign manager Faiz Shakir said in a statement.

The campaign noted that Sanders did not reach the 4 million donor mark in 2016 until after the New Hampshire Democratic primary.

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Sanders has relied on small-dollar donations to fund his presidential bids, refusing to take money from super PACs.

The progressive senator led the Democratic primary pack in fundraising in the third quarter, raking in $25.3 million. The fundraising haul was fueled by roughly 1.4 million donations.

His progressive rival, 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.), has also relied heavily on individual donations, bringing in $24.6 million in the third quarter.

Sanders's and Warren's fundraising strategies differ largely from more establishment figures in the Democratic primary field.

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 raised $15.2 million in the third quarter, while South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE (D) raised $19.1 million.

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Former Massachusetts Gov. Deval Patrick Deval PatrickRalph Gants, chief justice of Massachusetts supreme court, dies at 65 It's as if a Trump operative infiltrated the Democratic primary process Top Democratic super PACs team up to boost Biden MORE (D), who entered the crowded Democratic primary field last week, said on Sunday that he would not turn away super PACs that wanted to support his campaign.

"If there's a super PAC that supports you, you’re not going to tell them to stop?" NBC's Chuck Todd asked.

"No I’m not," Patrick responded.