Sen. Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE’s (I-Vt.) presidential campaign took in more than $1.2 million in donations in the two days after an attack from a super-PAC supporting Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE, according to the Huffington Post.

The donations poured into the campaign through the online fundraising site ActBlue.

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“We’ve never seen an immediate donor response like what the Sanders campaign received on Tuesday,” ActBlue Executive Director Erin Hill said. “At one point, it drove 180 contributions through our platform per minute.”

Correct the Record, a super-PAC led by Clinton ally David Brock, sent an email out on Monday comparing Sanders to British Labour Party leader Jeremy Corbyn, a committed socialist.

The attack linked Sanders, who identifies as a Democratic socialist, to controversial remarks made by Corbyn, including his praise of the late Venezuelan president Hugo Chávez.

The email also quoted Corbyn calling the death of Osama bin Laden “a tragedy,” as there was no attempt to arrest and put the al Qaeda leader on trial.

Sanders’s campaign blasted out a fundraising email in response to the super-PAC.

“Yesterday, one of Hillary Clinton’s most prominent Super PACs attacked our campaign pretty viciously,” an email sent by the Sanders campaign on Tuesday read.

“It was the kind of onslaught I expect to see from the Koch Brothers or Sheldon Adelson, and it’s the second time a billionaire Super PAC has tried to stop the momentum of the political revolution we’re building together.”

Sanders spokesman Michael Briggs said the super-PAC was “distorting the record.”

“It is disappointing that Secretary Clinton’s super-PAC is spreading disinformation about Bernie,” Briggs said. “This is exactly the kind of politics that Bernie is trying to change.”

Clinton herself has so far refused to take shots at Sanders and other Democratic candidates, focusing most of her attention on the Republican field.