The progressive group Democracy for America (DFA) endorsed Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE for president on Monday, giving the Vermont senator a key ally in the fight for the Democratic presidential nomination.

DFA had been on the sidelines, saying it was supportive of both Sanders and Sen. Elizabeth Warren Elizabeth WarrenNo new taxes for the ultra rich — fix bad tax policy instead Democrats back away from quick reversal of Trump tax cuts It's time for newspapers to stop endorsing presidential candidates MORE (D-Mass.), the two candidates in the Democratic primary most closely associated with the progressive left.

But DFA surveyed its members during an 11-day voting period in February and found that nearly 80 percent of its members support Sanders, easily surpassing the 67 percent threshold the group uses to determine whether it will endorse. Warren received 13 percent of the vote.

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“Bernie Sanders has built a powerful multi-racial, multi-generational movement and we’re excited to join the campaign at this critical moment in the Democratic race,” said DFA Chairman Charles Chamberlain. “From Super Tuesday to the Democratic Convention in Milwaukee, we’ll be working every day to make sure Bernie wins the most votes, the most delegates, and the most states nationwide to become the Democratic nominee and defeat Donald Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE in November.”

This is only the second time DFA has endorsed in a presidential primary.

The group also backed Sanders in 2016, helping him raise more than $2 million, organizing 119,000 volunteer shifts that contributed to the campaign knocking on 5 million doors and making 11 million phone calls.

DFA staffers also worked out of the Sanders campaign headquarters, helping to train volunteers or appearing as surrogates in the media.

The endorsement this year comes as Sanders has galvanized the left and topped Warren in each of the first four states to vote.

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Sanders is the favorite to win the Democratic nomination at the moment, but he faces a new challenge from former Vice President Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE, who electrified moderate Democrats over the weekend with a thunderous victory in the South Carolina primary.

The money and endorsements are flowing into the Biden campaign as voters in 14 states prepare to head to the polls for this cycle’s Super Tuesday.

Sanders is in a strong position, leading in California and Texas, the two biggest states to vote on Tuesday.

When a fight broke out among progressives earlier this year after Warren accused Sanders of telling her that a woman could not win the White House, DFA worked to keep the left unified, spearheading an agreement among liberal groups that they’d back either Sanders or Warren over the candidates from the “corporate wing” of the party.

DFA said it’s still committed to “focusing its fire in the fight for the Democratic nomination on candidates supported by the corporate wing.”

“The overwhelming support for Bernie we saw in our member vote should be a wake-up call to the broken, visionless, corporate Democratic establishment,” Chamberlain said. “Americans want fundamental change in Washington, not a return to the status quo.”