Raymond J. McGuire, a Black former Citigroup executive who has campaigned heavily in vote-rich southeast Queens, went to Minneapolis this past week with the Rev. Al Sharpton, the civil rights leader, to attend the trial over George Floyd’s death.
And on Friday, Ms. Wiley — a Black woman who already had the backing of the powerful Local 1199 of the Service Employees International Union — was endorsed by Representative Yvette Clarke, a Brooklyn Democrat and member of the Congressional Black Caucus. Dianne Morales, the most progressive candidate in the race, identifies as Afro-Latina and has sparked intense interest among left-wing grass-roots activists.
Mr. Stringer, with his significant war chest and roster of prominent endorsements, is competing for the city’s most progressive voters along with Ms. Wiley and Ms. Morales. Left-wing activists, alarmed by the perceived strength of Mr. Yang and Mr. Adams — two more centrist candidates — are strategizing about how to elevate a contender or group of contenders more aligned with their vision.
A number of organizations, from the left-wing Working Families Party to the United Federation of Teachers, are in the midst of endorsement processes, which could help voters narrow down their preferred candidates. Decisions may come as soon as this week.
There is still time for the race to evolve. Ms. Garcia is deeply respected by some of the people who know City Hall best. Mr. McGuire and Shaun Donovan, a former federal housing secretary, have aired television ads and have super PACs aiding them, a dynamic that could boost their ability to compete, though neither has yet caught fire.
Mr. McGuire, in particular, was embraced as a favorite of the business community early on — with the fund-raising to prove it — but there are growing signs that other candidates may also be acceptable to the city’s donor class.
Mr. Yang has been courting Mr. McGuire’s donors, encouraging them to take something of a portfolio management approach by investing in multiple candidates who are supportive of the business community, according to someone with direct knowledge of the conversations, who spoke on condition of anonymity to describe private discussions. The Yang campaign declined to comment.