When Ruben Diaz Jr. dropped out of the New York City mayor’s race last year, his decision surprised many. He had the support of the powerful Bronx Democratic Party, an alliance with Gov. Andrew M. Cuomo and strong ties to Latino voters.
But Mr. Diaz, the Bronx borough president, still can influence the race: His endorsement became one of the most coveted in the contest — potentially carrying weight in the Bronx and among Latino voters, who make up roughly one-fifth of Democratic primary voters.
On Monday, Mr. Diaz will announce that he is endorsing Eric Adams, the Brooklyn borough president, boosting Mr. Adams’s hopes of trying to assemble a diverse coalition to defeat Andrew Yang, the former presidential hopeful.