Days after New York state Assemblyman Zohran Mamdani’s stunning upset in the Democratic primary for mayor of New York City, an emerging effort to block his path to Gracie Mansion is now beginning to materialize among a coalition of Jewish community leaders, business executives and Republican donors who have expressed alarm about his far-left policies and strident opposition to Israel.

While still in its nascent stage, the anti-Mamdani coalition is coalescing behind Eric Adams, the embattled mayor who skipped the primary to run as an independent and launched his reelection bid on Thursday. The mayor, who a day before in an appearance on “Fox & Friends” had called Mamdani a “snake-oil salesman,” is gearing up for a public brawl with the 33-year-old assemblyman and democratic socialist aiming to unseat him.

“This election is a choice between a candidate with a blue collar and one with a silver spoon,” Adams said in his campaign announcement on the steps of City Hall, depicting Mamdani, the son of a Columbia University professor and a filmmaker, as privileged.

Political strategists say Mamdani, who upset former New York Gov. Andrew Cuomo in the Democratic primary and would enter the general election as the presumptive front-runner, is a formidable nominee, particularly as the scandal-tarred mayor confronts dismal favorability numbers owing largely to the federal corruption charges he avoided while forging an unpopular alliance with the Trump administration.

But some opponents of Mamdani view Adams as the most effective vehicle to stop the presumptive Democratic nominee from winning in November, and are readying for a fight. Among other possible efforts now in the works is a “big push” to create an independent expenditure committee backed by real estate executives and other donors to boost Adams’ campaign, according to one consultant familiar with the matter.

“That’s definitely going to happen,” the consultant told Jewish Insider on Thursday, speaking on the condition of anonymity to discuss ongoing private deliberations. “People aren’t going to be taking this easy and just dealing with Mamdani,” he explained, noting the pro-Israel donor community could join the outside spending effort. “I’m sure some people are, but the people who have a lot to lose aren’t.”

Eric Levine, a top Republican fundraiser in New York City, endorsed Adams on Wednesday and said in an interview that he believes it is a “feasible” goal to reelect the mayor, provided that Cuomo stays out of the race and Curtis Sliwa, the GOP nominee, ends his campaign in order to avoid splintering the vote. 

While Cuomo has yet to confirm if he will run on an independent ballot line, Sliwa has rejected growing calls for him to step aside. Jim Walden, a lawyer, is also running as an independent in what has become an unusually crowded race.

Levine, a board member of the Republican Jewish Coalition, said that he had received overwhelmingly positive responses since announcing his support for Adams in an email sent to 2,000 people — including from Democrats who backed Cuomo in the primary. “I’ve gotten feedback from a lot of people that this is a five-alarm fire and they’re going to line up behind Adams,” Levine told JI on Thursday, adding that he was “seriously considering” organizing a fundraiser for Adams and is hopeful Republican leaders would attend.

One strategist suggested that Adams could face backlash for campaigning with Republicans in the heavily Democratic city, especially as he has drawn scrutiny over his ties to the Trump administration. But the mayor will likely need to win support from a significant portion of GOP voters if he has any hope of building a viable coalition that has included Black and Orthodox Jewish residents whom Mamdani, with a long record of anti-Israel activism, has struggled to win over.

“Eric Adams has been a friend since his first days in office,” Leon Goldenberg, an executive board member of the Flatbush Jewish Community Coalition, said in a social media post. “Fighting antisemitism and standing with the Jewish community is in his DNA. The stakes are very high.”

The Jewish community, which overwhelmingly backed Cuomo in the primary, is expected to throw its support behind Adams, promising to deliver key voting blocs in November. Adams, who announced his reelection campaign alongside Orthodox leaders on Thursday, has long-standing ties to the community and during the primary engaged in a covert pressure campaign to try to influence the endorsement deliberations as Cuomo won backing from major Hasidic sects.

Leon Goldenberg, an executive board member of the Flatbush Jewish Community Coalition, said on Thursday he was supporting Adams’ campaign, the first endorsement from an Orthodox leader in what is anticipated to be many more heading into the fall.

“Eric Adams has been a friend since his first days in office,” Goldenberg, who has expressed concerns about Mamdani’s rise, said in a social media post. “Fighting antisemitism and standing with the Jewish community is in his DNA. The stakes are very high.”

Shabbos Kestenbaum, an Orthodox activist close to the Trump administration, has backed Adams and is also now seeking to rally support for his bid while urging Sliwa to drop out of the race. He said he was not yet at liberty to divulge specific names, but told JI he had been in communication with “Wall Street executives” as well as “young student activists” and a range of religious leaders about working to reelect Adams.

“There has really been a profound resurgence of a diverse coalition who truly, truly are terrified of Mamdani’s socialist dystopian future for New York City,” Kestenbaum said. 

Still, no major financial commitments appear to have been made yet, even as Adams reportedly met with business leaders this week to discuss the race. “People haven’t made decisions,” said a person who has met with donors about the election. “Those types of decisions can’t be made in two or three hours.”

“A lot of people are talking about Eric. I just don’t see it in terms of being a contender,” George Arzt, a veteran political consultant, told JI. “Mamdani is very articulate. He is very likable. He’s got to prove himself to the real estate community and to the Jewish community.”

Jay Martin, executive vice president of the New York Apartment Association, said his organization “isn’t making any decisions for a little while,” but he added that his peers in the industry would likely be rallying behind the mayor. “I think they are going to see what they can do with Adams at the moment,” he told JI.

Mamdani, who has won some support from Democratic leaders since Tuesday’s primary, has dismissed the gestating efforts to corral support for Adams, saying that they will prove ineffective as his movement continues to gain traction. “What we have shown in this primary is our ability to overcome the same billionaires who may fund Eric Adams’s re-election campaign,” he told The New York Times, “and ultimately we’re able to do so because of the power of New Yorkers across the five boroughs.”

George Arzt, a veteran political consultant, said he was doubtful Adams would be able to win re-election as mayor, even as he acknowledged that there are “a lot of people” in the real estate industry and the Jewish community who are “very worried” about Mamdani, who has proposed rent freezes while defending calls to “globalize the intifada,” among other things.

“A lot of people are talking about Eric. I just don’t see it in terms of being a contender,” Arzt told JI. “Mamdani is very articulate. He is very likable. He’s got to prove himself to the real estate community and to the Jewish community.”

Jerry Skurnik, a senior consultant for Engage Voters U.S., a political consulting firm, said that “it will be very hard to defeat Mamdani in November,” noting that after the ranked-choice voting count is finalized, “he’ll have received over 500,000 votes.”

“That’s a pretty good start to a majority as he’ll have opportunity to then add votes from Democrats who didn’t vote in the primary and Democratic-leaning independents,” Skurnik added, before including a caveat. “On the other hand, I didn’t think Mamdani had a chance to win the primary until recently, so I don’t rule out anything.”