Democratic socialist Zohran Mamdani prevailed in Tuesday's Democratic mayoral primary in New York City after running a grassroots campaign centered on delivering transformative change and lower costs in the expensive metropolis.

Disgraced former New York Gov. Andrew Cuomo, who was backed by prominent national Democrats and an unprecedentedly deep-pocketed super PAC funded by billionaires and corporations, conceded defeat after it became clear that the New York State assemblyman's lead was insurmountable. With 93 poercent of the votes tallied, Mamdani led Cuomo 43.5 percent to 36.4 percent.

Mamdani's primary win, a stunning upset, is expected to become official after the ranked-choice tally next week. In his victory speech, Mamdani said that his campaign and its supporters "made history."

"In the words of Nelson Mandela, 'It always seems impossible until it is done,'" he added. "My friends, we have done it."

Affordability was a key focus of Mamdani's policy platform and messaging, which called for an immediate rent freeze for all of the city's rent-stabilized tenants, the creation of a network of city-owned grocery stores focused not on profits but on "keeping prices low," and free childcare.

Mamdani proposed funding those and other priorities with a higher tax rate on corporations and city residents earning more than $1 million per year—fueling the backlash his campaign faced from the ultra-wealthy.

Aru Shiney-Ajay, executive director of the Sunrise Movement—whose local chapter knocked on over 20,000 doors for the race—said in a statement that "the people of New York City proved that a movement powered by hope, courage, and working people can beat the money of billionaires."

"This is what it looks like to take back power," said Shiney-Ajay. "Pundits, billionaires, and the political establishment said it couldn't be done. But this campaign shattered that belief."

Shiney-Ajay, like other progressives, argued that Mamdani's campaign should serve as a model for the rudderless Democratic Party as it tries to recover from its devastating loss to President Donald Trump and the Republican Party in last year's election.

"Zohran Mamdani is the future of the Democratic Party," said Shiney-Ajay. "This kind of campaign and vision is what the party needs to rebuild trust with young voters and working-class voters, so we can defeat Trump and his allies."

Joseph Geevarghese, executive director of Our Revolution—a national progressive advocacy group that endorsed Mamdani—said that the democratic socialist's win "has shaken the political establishment and proven that a united grassroots movement can take down even the most entrenched, powerful forces."

"This race was a showdown between the billionaire-backed status quo—which poured tens of millions into pro-Cuomo super PACs—and a new generation ready to crush corporate greed and deliver real results for working people," said Geevarghese. "The demand for people-powered change is loud, clear, and unstoppable."

While the winner of New York City's Democratic mayoral primary would typically be considered the heavy favorite going into the general election, "this fall's contest promises to be unusually volatile," The New York Timesobserved, noting that it will "include Mayor Eric Adams, who is running as an independent."

Despite conceding defeat in Tuesday's primary, Cuomo left open the possibility of running as an independent in November.

Following his win, Mamdani supporters pointed to his broad support and successful coalition-building as reasons to be optimistic about his general-election prospects.

"The results make clear that his voting base wasn't limited to young, college-educated voters most engaged by his campaign," Bhaskar Sunkara, the president of The Nation and founding editor of Jacobin, wrote Wednesday. "Notably, Mamdani succeeded in neighborhoods like Bay Ridge, Bensonhurst, Dyker Heights, Sunset Park, and Brighton Beach—all areas that swung rightward in the 2024 presidential election."

"Mamdani has undoubtedly delivered a major victory in America's largest city," Sunkara added. "But we must be sober about the challenges ahead. Electoral wins are meaningful only if they translate into tangible improvements in people's lives, and political momentum can dissipate quickly if governance falls short. Mamdani faces an enormous responsibility—not only to his immediate constituency but also to a broader progressive movement watching closely from across the country and the world."

Reprinted with permission from Alternet