Mamdani-backed progressive candidates win key Democratic primaries in New York

Avila Chevalier's upset in Brooklyn and Queens

Another Mamdani-backed candidate, Claire Valdez, won her primary in Queens and Brooklyn by a margin of more than 20 percentage points. In a separate race, 36-year-old Mamdani ally unseated Brooklyn Borough President Antonio Reynoso, consolidating the mayor's grip on local Democratic politics.

The results are being read as an early verdict on Mamdani's tenure, which began roughly six months ago. His policy platform — rent controls, higher taxes on millionaires and an immigration-friendly posture — has been framed as the opposite of the Trump administration's priorities. The primary outcomes suggest that platform is resonating with the city's Democratic base.

Lander's comptroller win and the party's institutional wing

In the race for city comptroller, Brad Lander, a former city auditor and 2025 mayoral candidate, won the Democratic nomination by a wide margin, taking 66 percent to 34 percent of the vote. Lander, a veteran of city politics, represents a more institutional wing of the party that has so far coexisted uneasily with Mamdani's insurgent movement.

Analysts noted that Mamdani's appeal to younger voters could give him outsize influence when Democrats choose their 2028 presidential nominee. Kennedy family scion Jack Schlossberg, a frequent Mamdani critic, has warned that the mayor's foreign policy positions, particularly on Israel, risk alienating moderates in a national general election.

The wins also underscored how Mamdani's political operation has moved beyond symbolic endorsements to invest in competitive races. Avila Chevalier's campaign, in particular, drew on the activist networks that formed during the 2023–2024 campus protests, deploying organizers with experience in direct-action politics rather than traditional Democratic club infrastructure.

Implications for the 2028 presidential race

Espaillat's defeat marked the most striking loss for the old guard. First elected to the House in 2016 after representing upper Manhattan and the Bronx in the state legislature, he had been considered a near-perennial incumbent in his district. His loss to a first-time candidate backed by the mayor signals a generational and ideological realignment within New York Democratic politics.

Mamdani's team framed the results as evidence that a Democratic politics built on economic populism and openness to immigration can win in one of the country's largest cities. Critics, including some centrist Democrats, argued that the slate's positions on Israel and policing could complicate efforts to win back suburban voters in statewide and federal races.

With all city council seats now formally nominated, attention turns to the November general election, where Democratic candidates in the city are heavily favored. The bigger question, party strategists said, is whether Mamdani's coalition can be replicated outside New York ahead of the next presidential cycle.