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Mayor Bill de Blasio has at least one thing in common with President Trump, the man he would like to unseat: Their fellow New Yorkers love to hate them.
In a Siena College Research Institute poll released on Monday, the two men outdid all other New York politicians in receiving a negative net favorability rating.
Among registered voters statewide who responded to the poll, 34 percent had a favorable opinion of Mr. Trump, while 63 percent had an unfavorable opinion — for a net negative of 29 percent.
Mr. de Blasio, who has embarked on a long-shot campaign for president, did almost as badly: 29 percent had a favorable opinion and 53 percent an unfavorable opinion — for a net negative of 24 percent.
No other politician came close in the overall disapprobation of the citizenry. Senator Chuck Schumer, Gov. Andrew M. Cuomo and Senator Kirsten Gillibrand (who, like Mr. de Blasio, is also running for the Democratic presidential nomination) all had net positive ratings in the poll.
For Mr. de Blasio, it is a problem that has dogged him since he first talked about running for president months ago: How can he win over voters in Des Moines and Las Vegas if people at home don’t seem to like him?
For both Mr. de Blasio and Mr. Trump, there are nuances in the numbers.
Mr. de Blasio has earned consistently favorable numbers from black voters during his two terms, while white voters reject him. Yet, while he easily won re-election in 2017, the Siena poll showed that even in New York City he earns an overall unfavorable rating from registered voters, with more than half voicing a negative opinion.
Even within the Democratic Party, registered voters in New York gave Mr. de Blasio a thumbs down — with 45 percent saying they did not like him, compared to 39 percent who said they did.
Mr. de Blasio has said that he is not concerned by poor polling numbers and that the only poll that counts is when voters cast their ballots.
The poll of 812 registered voters was taken in early June and has a margin of error of plus or minus 4.1 percentage points.
Mr. Trump, a Republican who lost the state in 2016 to the Democratic candidate, Hillary Clinton, by a large margin, still sees strong support from his party: 70 percent of Republicans had a favorable opinion, compared with 29 percent who did not.
But in almost any other demographic, Mr. Trump fares poorly in New York. White, black and Latino voters all voiced a majority unfavorable opinion, as did both men and women, Catholics and Protestants. His unfavorable rating dipped below the halfway mark among Jews, where 48 percent offered a negative opinion, compared to 44 percent who had a favorable view.
Steven Greenberg, a Siena pollster, said that Mr. Trump’s showing made sense, given that registered Democrats outnumber registered Republicans in New York by more than 2 to 1.
But Mr. de Blasio’s rejection by voters of both parties was striking. “He is underwater with Democrats. He’s also well underwater with New York City voters,” Mr. Greenberg said, calling the showing “horrible” for a Democratic politician.
He said it is difficult to pinpoint the cause of Mr. de Blasio’s unpopularity, but that the mayor has seen a gradual decline since he started talking about running for president early this year. In a similar poll in January, Mr. de Blasio had a 38 percent favorable response and 46 percent unfavorable — a gap of 8 percent, compared to 24 percent today.
In January 2018, respondents were far more positive, with 44 percent showing a favorable opinion of Mr. de Blasio, against 37 percent unfavorable.
Mr. de Blasio’s dismal numbers are not limited to the Siena poll. Last week the website FiveThirtyEight, in an analysis of May polling data, found that Mr. de Blasio was the only Democratic hopeful with a net negative favorability rating.
And in a Des Moines Register/CNN/Mediacom poll this month, none of the 600 likely Democratic caucus participants surveyed said that Mr. de Blasio was either their first or second choice to be president.