“He is like a recurring nightmare. It’s like one of those ‘Damien’ movies..."

John P. Coale, a wealthy lawyer supportive of Mrs. Clinton, said many donors gave money to Mr. Weiner out of friendship with Ms. Abedin.

But Mr. Coale said the 2013 race, which brought new revelations of more sexting, had been exasperating. “It was just too much for everybody,” Mr. Coale said. “And now, it’s out of the park. Come on.”

Bill Hyers, a Democratic strategist who managed Mayor Bill de Blasio’s campaign that year, said the party establishment had erred by allowing Mr. Weiner “a second breath of life.”

“They knew he was a narcissist who was massively flawed,” Mr. Hyers said. “And now we’re all still stuck with him.”

Among Democrats who shunned Mr. Weiner from the start, there was little joy at the apparent vindication of their judgment. Sarah Kovner, a major Democratic donor, said there was less concern that Weiner-inflicted injuries might cost Mrs. Clinton the election, than sheer frustration that a known bad seed had created such endless tumult