As New York City voters tilt slightly toward the center, the left-leaning Working Families Party hopes that a slate of four mayoral candidates will be better than the one moderate rival currently leading the polls, former Gov. Andrew M. Cuomo.

The party on Saturday voted to endorse a slate of four candidates for mayor: Zohran Mamdani, an assemblyman from Queens; Brad Lander, the city comptroller; Adrienne Adams, the speaker of the City Council; and Zellnor Myrie, a state senator from Brooklyn.

Ana María Archila and Jasmine Gripper, co-directors of the New York Working Families Party, said in a statement that the city deserved a mayor who could “leave behind the scandal and corruption of the past and lead with integrity.”

The four candidates “each have a record of fighting for working families, a vision to make New York City safe and affordable for all and the courage to stand up to Trump,” they added.

The slate is the first of a two-part endorsement process that the party has embraced for the June 24 primary. In May, the group plans to throw its support behind a single candidate that its leaders believe is best positioned to defeat Mr. Cuomo.

In the 2021 Democratic mayoral primary, the three candidates backed by the Working Families Party failed to make the final round under the city’s new ranked-choice voting system. This year, the group has adjusted its endorsement process in an effort to better leverage its influence.

Candidates vying for the party’s support this year were asked to commit to working collaboratively with one another, and to encourage their supporters not to rank either Mr. Cuomo or Mayor Eric Adams. Six Democrats applied for the party’s endorsement and all agreed to those terms.

Party leaders have not yet decided on a concrete strategy for how to consolidate support around their first choice, but they have weighed obligating other candidates seeking the group’s endorsement to cross-endorse the party’s top choice.

“Our task, and that of every W.F.P.-endorsed candidate, is to remind New Yorkers of Cuomo’s real record, and to communicate to voters they don’t have to settle,” the group wrote in a memo outlining its strategy this month. “They can elect a new mayor who will stand up for working families, not the billionaires.”

The memo defined the contest as “working-families champions vs. the power-hungry, scandal-ridden politicians,” themes that all four candidates hit on in a series of statements on Saturday.

Mr. Lander said he wanted to work with the party to “deliver a safer, more affordable, better-run city so that all working families can build their lives here as I have.”

Ms. Adams referenced growing up in a union household. “That’s where I come from, who I fight for and who I’ll always be accountable to,” she said.

Mr. Myrie said he was “running to make New York more affordable, livable and safe for everyone” by building more affordable housing and creating enhanced child care options.

Mr. Mamdani mentioned Mr. Cuomo and President Trump directly and said that he was “fighting for a city that working people can actually afford.”

The party’s four-headed endorsement is part of a broader strategy among progressives seeking to thwart Mr. Cuomo, even as he garners more endorsements and support from key voting blocs.

On Sunday, the former governor is expected to receive the backing of Representative Gregory Meeks of New York, a onetime ally of the mayor who also serves as chairman of the Queens Democratic Party. Mr. Meeks helped Ms. Adams form a coalition to win the speaker’s role.

“New York has a crisis of affordability, of quality of life and of leadership, and Governor Cuomo is the only person in this race with the proven track record of results to tackle these issues head on,” said Rich Azzopardi, a spokesman for Mr. Cuomo.

But the former governor’s foes, including the Working Families Party, hope to seize on a variety of issues of Mr. Cuomo’s own, such as the sexual harassment accusations that led to his resignation in 2021. Mr. Cuomo denies wrongdoing.

The party’s endorsement could also hurt progressive candidates who failed to receive it. They include Jessica Ramos, a state senator from Queens who has struggled to raise money.

Mr. Lander has aggressively attacked Mr. Cuomo but has not risen in the polls. Ms. Adams was a late entrant to the race and lacks name recognition. Mr. Myrie is also struggling in that department.

Mr. Mamdani, whose online persona and relentless focus on affordability in his campaign message, has made strides to counter Mr. Cuomo’s momentum and could add new voters to his coalition as part of that effort. Several recent polls show him second, well behind Mr. Cuomo but leading the progressive lane with impressive fund-raising numbers.