Bill de Blasio, the former mayor of New York City, said on Tuesday that he would not run for governor of New York, as he had been widely expected to do.
Mr. de Blasio, a Democrat who served two terms in office, had signaled for months that he was planning a campaign, saying repeatedly that he did not feel ready to leave public service.
He made the announcement in a video posted on Twitter, in which he highlighted the accomplishments of his mayoral tenure before announcing that he would not be joining the governor’s race.
“No, I am not going to be running for governor in New York State,” Mr. de Blasio said, standing on the street outside his Brooklyn residence. “But I am going to devote every fiber of my being to fight inequality in the state of New York.”
Mr. de Blasio then hinted that he would have more announcements to make in the coming days.
He declined to enter a crowded Democratic primary field, with the incumbent, Gov. Kathy Hochul, facing challenges from Jumaane D. Williams, the city’s public advocate, and Representative Tom Suozzi of Long Island.
A Siena College poll released earlier on Tuesday showed Ms. Hochul with a significant lead over her competitors and potential competitors, including Mr. de Blasio. She earned the support of 46 percent of Democrats polled, while Mr. de Blasio had 12 percent, Mr. Williams had 11 percent and Mr. Suozzi had 6 percent. The poll had a margin of error of plus or minus 4 percentage points.
Mr. de Blasio had said that he was not deterred by polls that showed him badly trailing in hypothetical Democratic primary matchups for governor.
“I have a long, rich history of being an underdog,” he said.
Ashley Wong contributed reporting.