New York socialist sweep deepens Democratic divide as Jeffries scrambles to hold his caucus together

By Alex Tanzer, 
updated on June 29, 2026

Three candidates backed by New York City Mayor Zohran Mamdani won congressional primaries in New York last Tuesday, and at least two of them, Claire Valdez and Darializa Avila Chevalier, are card-carrying members of the Democratic Socialists of America. The third, Brad Lander, defeated incumbent Rep. Dan Goldman, who had the backing of House leadership, by a lopsided 66.5% to 33.5%. The results land squarely in House Democratic Leader Hakeem Jeffries' own backyard, and they present him with a problem that congratulatory social media posts cannot solve.

Jeffries, a Brooklyn Democrat who has spent years positioning himself as a mainstream alternative to the party's progressive wing, now faces a caucus that is about to absorb members who have called for abolishing police and prisons, eliminating borders and ICE, and described America in terms unfit for print. The question is no longer whether socialism has a foothold in the Democratic Party. It is whether the party's leader can keep the tent standing while its newest occupants set fire to the poles.

The primary results and what they mean

The Tuesday primaries gave Mamdani's political machine a clean sweep. Chevalier, a DSA member, unseated Rep. Adriano Espaillat, who was considered close to Jeffries. Valdez won the primary for New York's 7th Congressional District, a stretch of Brooklyn and Queens that has earned the nickname "the Commie Corridor" for the DSA's electoral dominance there. Lander's rout of Goldman, a Jeffries ally backed by the Democratic establishment, was the most decisive margin of the night.

The victories did not come out of nowhere. Mamdani won the New York City mayor's race last November on a democratic socialist platform. Bernie Sanders demonstrated twice that the label carries real appeal inside Democratic presidential politics. And Alexandria Ocasio-Cortez transformed progressive activism into celebrity politics during Trump's first term, paving the way for the Squad's successors.

But the new class goes further than AOC ever did. Chevalier's social media history, spanning years of posts that surfaced after her primary win, includes calls to abolish police and prisons, demands to eliminate ICE and borders, and harsh, profane attacks on Kamala Harris and Joe Biden. She described America as "a f------ disgrace." Posts involving race, white women, and interracial relationships drew particular scrutiny. She has since deleted and repudiated some of the posts, but the damage was already spreading across conservative media and, eventually, onto MSNBC and CNN.

Jeffries congratulates, and dodges

On Saturday afternoon, Jeffries posted on X what his spokeswoman described as a routine congratulatory message, the kind he has issued in virtually every race this cycle, on behalf of nominees from every state, background, and ideology. The post read:

"Congratulations to our newest members of the NYC congressional delegation. From public servants to union organizers to community activists, the path is different but the work is the same. We must decisively address the affordability crisis and crush far-right extremism!"

Notice what the post does not do. It does not mention socialism. It does not mention DSA. It does not mention any of the positions that have made Chevalier a lightning rod. It pivots immediately to "affordability", the safe ground Jeffries has staked out, and closes with a swipe at the right. It is a message engineered to say nothing while appearing to say something.

Almost immediately after Tuesday's results, reporters and anchors began pressing Jeffries on the nominees' positions. He acknowledged in media interviews that he did not share every position of the new nominees, but he steered the conversation back to affordability every time. His argument, distilled: most Americans don't want a political revolution; they want lower grocery bills.

That may be true. But it sidesteps the problem. The people entering his caucus do want a political revolution. And they are not shy about saying so.

Moderates sound the alarm

Rep. Josh Gottheimer, a leading centrist Democrat from New Jersey, told Jewish Insider that the socialists' anti-Israel stance represents "a growing cancer, and we can't let it spread, and we cannot ignore it." He warned that the incoming DSA-aligned lawmakers will come to Washington to "wreak havoc in Congress" and try to "hold the party hostage" to their socialist views.

"It will lead to more gridlock and dysfunction, and hard-working families will pay the price for this. The socialists have put their own personal hatred above our national security and our promises to our allies. And I think we've got to call out hate when we see it."

Gottheimer's language, "cancer," "hostage," "hatred", reflects genuine alarm within the moderate wing. These are not backbenchers grumbling off the record. This is a senior member of the caucus publicly warning that the party is absorbing elements hostile to its own stated values.

Veteran Democratic strategist James Carville went further. He called the situation "a bridge too far" and demanded that Democrats refuse to seat Chevalier in the caucus, citing her views on interracial relationships, the American flag, and pluralism itself:

"They should not seat her in the caucus. Her views are totally against anything that any Democrat has. We believe in pluralism, she doesn't believe in interracial dating... Lady, I ain't in the same party as you... She has attacked interracial relationships and the American flag."

Carville then used a word Democrats almost never say out loud about their own coalition:

"I actually do think it's time for Democrats to talk the S word. Schism. I really do. Everybody's always said, 'No, no, we're a coalition. We're a big tent.' And there's some, there's just some s*** that I can't be in the same tent with."

One unnamed Democratic Party stalwart, as Fox News reported, compared Chevalier directly to former Klansman David Duke: "Chevalier is our David Duke. She is poisoning the possibility of a Democratic majority."

The progressive wing pushes back

Not everyone in the party sees the socialist surge as a crisis. An unnamed Democrat familiar with the House caucus, aligned with the progressive wing, offered a sharply different read:

"The reality is that the energy of the party in primaries is anti-genocide, anti-billionaire and for Medicare-for-all. Many centrists and House Democratic members are having a hard time coming to terms with this. But that's where voters primary are. They are unfortunately jamming Jeffries unnecessarily instead of letting him embrace the progressive wing."

That framing, that the socialist surge reflects the authentic will of Democratic primary voters, is precisely what makes the problem so difficult for Jeffries. If the base wants socialism, then fighting it means fighting your own voters. But if the leadership embraces it, the party loses the swing districts it needs to win a majority.

A veteran Democratic political operative in New York offered a more pragmatic defense of Jeffries' balancing act: "There is no win by holding out and claiming these folks are socialists and therefore not our people. They are going to vote for Jeffries [for Speaker] and we will need their votes for that and much more going forward." The operative noted that Democrats who failed to recognize the leftward shift in last year's mayoral race "paid a real price for not recognizing it."

The arithmetic trap

That operative's point about Speaker votes gets at the structural reality Jeffries cannot escape. Assembling 218 votes for a House majority requires every faction. Kevin McCarthy learned that lesson when a small bloc of ideological holdouts derailed his speakership. Mike Johnson is enduring the same challenge now. If Democrats win the House, Jeffries will need the DSA members' votes, and they will know it.

The New York Post reported that both Chevalier and Valdez refused to commit to supporting Jeffries as Democratic leader, while Lander signaled only conditional support with "accountability demands." That is not the language of loyal foot soldiers. It is the language of a faction that intends to extract concessions.

And the socialist wave is not confined to New York. DSA-backed candidates have won or led in primaries in Pennsylvania, California, and Colorado as well, suggesting a national pattern rather than a local anomaly.

Meanwhile, at a New York election night victory party last week, DSA celebrants chanted "You're next!" when Jeffries' image appeared on screen. The man they need for Speaker is also the man they want to replace. That is not a coalition. It is an uneasy hostage arrangement with a ticking clock.

The leadership vacuum

Nancy Pelosi faced a version of this problem during Trump's first term, when the Squad, AOC, Ilhan Omar, Rashida Tlaib, Ayanna Pressley, became media stars almost overnight. But Pelosi managed them institutionally. She controlled committee assignments, raised money, and determined legislative priorities. She never tried to defeat them ideologically. She simply boxed them in.

Jeffries does not have Pelosi's leverage. He is not Speaker. He does not control committee assignments. And the socialist contingent entering the caucus is larger, more organized, and more confrontational than the original Squad ever was. Mamdani's political operation in New York has proven it can unseat incumbents aligned with Jeffries, a capability Pelosi's progressive challengers never demonstrated at this scale.

The Breitbart report on Jeffries' earlier endorsement of Mamdani noted that an October Axios survey found only 24 of 113 Democratic House hopefuls confirmed support for Jeffries as party leader, with 57 non-committal and 20 explicitly opposed. A Gallup poll showed 66% of Democrats view socialism favorably, compared to only 42% who favor capitalism. Those numbers suggest the ideological center of gravity in the Democratic Party has already shifted, and Jeffries is standing on ground that is moving beneath him.

Republicans see an opening

President Trump, speaking Friday at the Faith & Freedom Coalition's policy conference, framed the Democratic divisions in stark terms:

"The Democrat Party is in big trouble. Because this isn't stopping with New York. This is the most serious threat to our country in its existence, in my opinion."

Republicans have been handed a gift. Chevalier's social media posts, the DSA's open hostility to law enforcement and border security, the chants aimed at Jeffries, all of it provides ready-made material for competitive districts where Democrats need to appear moderate. Every Democratic candidate in a swing seat will now face a simple question: Do you agree with your party's newest members that America is, in their words, "a f------ disgrace"?

The Washington Free Beacon reported that Chi Ossé, a 27-year-old DSA member and Brooklyn city councilman allied with Mamdani, has launched a primary challenge directly against Jeffries himself. Ossé has called for defunding the NYPD and labeled Israel's war in Gaza a "genocide." The challenge may be a long shot, but it forces Jeffries to defend his own seat while managing a fractured caucus, a two-front problem no leader wants.

The NRCC wasted no time. Spokesman Mike Marinella declared that "so-called Leader Hakeem Jeffries has officially surrendered to Zohran Mamdani and the socialist mob now running the Democrat Party." That is campaign rhetoric, not analysis. But it lands because Jeffries' own actions, the congratulatory post, the pivot to affordability, the refusal to draw bright lines, make it hard to argue otherwise.

The road ahead

Jeffries believes Democrats need to look mainstream to win swing districts. He believes affordability is a stronger message than ideology. He may be right on both counts. But believing it and enforcing it are different things, and every day his caucus absorbs members who want to abolish police, eliminate borders, and remake American society from the ground up, the gap between Jeffries' message and his party's reality grows wider.

Carville wants a schism. Gottheimer wants a fight. The progressives want Jeffries to stop resisting and embrace the left. And the voters who will decide the House majority in November want none of the above, they want someone who will bring down the price of eggs.

Jeffries is trying to be all things to all factions. History suggests that leaders who try to hold together coalitions that despise each other don't get remembered as uniters. They get remembered as the last person holding the rope before it snapped.

About Alex Tanzer

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