All three of his endorsed candidates won. Two defeated sitting members of Congress.
On a Tuesday in late June, voters across four states rendered verdicts that revealed something deeper than electoral outcomes — a realignment of power within the Democratic Party. In New York, newly elected Mayor Zohran Mamdani demonstrated that a fresh political force, rooted in democratic socialism and shaped by the urgencies of Gaza and generational change, could unseat the party's established order. The governors, the House leadership, and the old machinery of influence found themselves on the losing side, suggesting that the center of gravity in urban Democratic politics is shifting toward something newer, and less certain.
- Mamdani's three-for-three endorsement record shattered the assumption that New York's Democratic establishment — Hochul, Jeffries, and James — still controlled the party's direction.
- The Gaza fault line cut through multiple races, turning questions of foreign policy into litmus tests that divided Jewish candidates, Hispanic caucus leaders, and progressive coalitions alike.
- A 32-year-old former field organizer defeating a 71-year-old incumbent who chaired the Congressional Hispanic Caucus sent shockwaves through Washington, exposing how quickly loyalties and expectations can collapse.
- The $26 million 12th District spectacle — featuring a Kennedy grandson, a Trump antagonist promising self-imposed term limits, and an AI regulation candidate — illustrated how chaotic and celebrity-saturated even safe Democratic seats have become.
- In November's battleground arithmetic, New York's 17th District and Utah's newly redrawn seat loom as pivotal pieces in the contest for House control, with Trump's endorsement machinery still humming on the Republican side.
On a Tuesday in late June, voters across four states settled primaries that would send ripples into November — and in New York, the results told a story about who now holds power inside the Democratic Party.
Mayor Zohran Mamdani, barely settled into Gracie Mansion, had endorsed three congressional candidates in competitive Democratic races. All three won, and two of them defeated sitting members of Congress. He had cut ads that ran during Knicks playoff games and campaigned personally for his picks. The message was unmistakable: the old establishment — Governor Hochul, House Minority Leader Jeffries, the party machinery — no longer commanded the field.
In the 10th District, Brad Lander defeated incumbent Daniel Goldman in a race defined by their divergent positions on Gaza. Goldman, one of Congress's wealthiest members, had drawn support from Hochul and Jeffries. Lander ran to his left, backed by Mamdani, Bernie Sanders, and Alexandria Ocasio-Cortez. In the 7th District, democratic socialist Claire Valdez defeated the candidate chosen by retiring 16-term incumbent Nydia Velázquez, signaling that even the established progressive wing now faces pressure from further left.
The most stunning result came in the 13th District, where Avila Chevalier — 32 years old, a former Mamdani field organizer — defeated Adriano Espaillat, a 71-year-old incumbent, former chair of the Congressional Hispanic Caucus, and the first formerly undocumented immigrant to serve in the House. Espaillat had not anticipated a serious challenge. Hochul, Jeffries, and Attorney General Letitia James all backed him. He lost.
Elsewhere, the 12th District primary to succeed the retiring Jerry Nadler drew $26 million in spending and an unlikely cast of characters — a Kennedy grandson, a former Republican Trump antagonist pledging a single term to pursue impeachment, and a candidate running on artificial intelligence regulation. State assemblyman Micah Lasher, endorsed by Nadler and Bloomberg, won the nomination.
Beyond New York, the primaries confirmed that Trump's endorsement still moves Republican voters, even when he hedged in South Carolina's gubernatorial runoff by eventually backing both candidates. In Maryland, a crowded Democratic field to succeed the retiring Steny Hoyer produced a nominee who will face incumbent Governor Wes Moore — a Democrat already discussed as a potential 2028 presidential contender — on the Republican side. In Utah, former congressman Ben McAdams won a primary in a redrawn district analysts consider a likely Democratic pickup in November.
The competitive House race to watch remains New York's 17th District, where Democrat Cait Conley will face Republican Mike Lawler in a seat Kamala Harris carried in 2024 — one of only three such Republican-held districts in the country, and rated a toss-up heading into fall.
On a Tuesday in late June, voters across four states walked into polling places to settle contests that would reshape the political landscape heading into November. In New York, the results told a story about the shifting power within the Democratic Party—and about one man's unexpected influence over its future.
James Mamdani, the newly elected New York City mayor, had endorsed three congressional candidates in competitive Democratic primaries. All three won. Two of them defeated sitting members of Congress. Mamdani had cut advertisements for his picks that aired during Knicks playoff games, and he campaigned on their behalf. The results suggested that the political establishment in New York—the governors, the House leadership, the party machinery—no longer held the kind of sway it once did.
In Manhattan's 10th District, which stretches from Lower Manhattan into Brooklyn, Brad Lander defeated incumbent Daniel Goldman. The two men were both Jewish, but they disagreed sharply on Israel's military actions in Gaza, a divide that became the race's central fault line. Goldman, an heir to the Levi Strauss fortune and one of Congress's wealthiest members, had advocated for stronger support for Israel than many progressive Democrats preferred. Lander, backed by Mamdani, Bernie Sanders, and Alexandria Ocasio-Cortez, ran to his left. Governor Kathy Hochul and House Minority Leader Hakeem Jeffries had supported Goldman. They lost. The district leans heavily Democratic, meaning Lander is favored to win in November.
In the 7th District, which encompasses parts of western Brooklyn and Queens—a neighborhood known for its leftward tilt—Nydia Velázquez announced her retirement after 16 terms in Congress. She had chosen Brooklyn Borough President Antonio Reynoso, a progressive, as her successor. Mamdani backed someone else: Claire Valdez, an assemblywoman and democratic socialist. Valdez won decisively. Her victory represented a clash between the established progressive wing of the Democratic Party and a newer cohort of democratic socialists who saw themselves as pushing the party further left.
The 13th District race proved the most shocking. Mamdani endorsed Avila Chevalier, a 32-year-old who had worked as one of his field organizers during his mayoral campaign, against Adriano Espaillat, a 71-year-old incumbent who had served in Congress since 2017 and chaired the Congressional Hispanic Caucus. Espaillat was the first formerly undocumented immigrant to serve in the House. He had not expected a serious primary challenge. But Mamdani's endorsement of Chevalier stunned the Hispanic Caucus. The New York Times reported that Mamdani had agreed last year to back Espaillat before changing course. Hochul, Jeffries, and Attorney General Letitia James all supported Espaillat. Chevalier won. During a debate, Espaillat had raised some of her deleted social media posts, including one in which she expressed profanity toward Vice President Kamala Harris. Chevalier apologized for the posts.
Elsewhere in New York, in the wealthy 12th District encompassing Midtown Manhattan and the Upper East and West Sides, longtime Representative Jerry Nadler retired, opening a seat in one of the nation's richest congressional districts. Micah Lasher, a state assemblyman and former Nadler aide, won the Democratic nomination. The race had drawn $26 million in advertising spending and featured an unusual cast: Alex Bores, who ran on regulating artificial intelligence; George Conway, the former Republican and Trump antagonist who said he would serve only one term to impeach the president; and Jack Schlossberg, John F. Kennedy's grandson and social media personality. Nadler had endorsed Lasher, as had Michael Bloomberg and Governor Hochul. Mamdani, who now lives in Gracie Mansion, confirmed he voted in the race but declined to say for whom.
In the 17th District, which includes parts of Westchester County and the Hudson Valley, Cait Conley, a former Biden administration cybersecurity expert, won the Democratic primary. She will face Republican Mike Lawler in November. Lawler is one of only three Republicans representing a district that Kamala Harris won in 2024, making it a key battleground. The Cook Political Report rates the race a toss-up, and Trump has campaigned there for Lawler.
Beyond New York, the primaries revealed the enduring power of Trump's endorsement within the Republican Party. In South Carolina's gubernatorial runoff, Trump initially backed Lieutenant Governor Pamela Evette, but after State Attorney General Alan Wilson gained momentum in the polls, Trump announced he would endorse both candidates, saying he did not want to hurt either one. Wilson advanced to face Democrat Jermaine Johnson in November. In Maryland, Democrat Adrian Boafo won a crowded primary to succeed Steny Hoyer, who retired after nearly 45 years in Congress. Republican Dan Cox won the GOP primary and will face incumbent Governor Wes Moore, a Democrat widely viewed as a potential 2028 presidential candidate. In Utah, Democrat Ben McAdams, the last Democrat to represent the state in Congress, won a primary in a newly redrawn district that political analysts consider a safe pickup for Democrats in November.
Notable Quotes
Americans are hungry for change— Nydia Velázquez, retiring congresswoman, referencing Mamdani's mayoral victory
I can't hurt one of them by only endorsing the other, so, therefore, I am going to endorse, for Governor of South Carolina, both Pam Evette and Alan Wilson— Donald Trump, on Truth Social regarding South Carolina's gubernatorial runoff
The Hearth Conversation Another angle on the story
Why did Mamdani's endorsements matter so much? He's the mayor of New York City, not a party boss.
He ran as an outsider just months ago. He won on a platform of change. When he backs someone in a primary, it signals to voters that this candidate represents something different from the establishment—from Hochul, from Jeffries, from the old guard.
But these were sitting members of Congress he defeated. Espaillat especially—he's the first undocumented immigrant to serve in the House. That's a powerful story.
It is. But Chevalier's victory suggests that voters in that district cared more about Mamdani's endorsement and what it represented than about Espaillat's historic achievement or his seniority.
The Gaza issue keeps appearing in these races. Is that what's really driving the Democratic Party apart?
It's one fracture line, but not the only one. You see democratic socialists like Valdez running against progressives like Reynoso. You see questions about who the party is for and what it stands for. Gaza is the visible wound, but the underlying tension is about the party's direction.
What about Trump's endorsement in South Carolina? He endorsed both candidates.
That's a retreat. His endorsements haven't been working as well lately. By endorsing both, he avoids the embarrassment of backing a loser. But it also shows his power has limits.
Do these New York results tell us anything about November?
They suggest that anti-establishment energy is real and that traditional party machinery can't stop it. Whether that helps or hurts Democrats in the general election depends on whether these new candidates can win over the broader electorate.