And the rally, intended to be a symbol of New York Democratic unity in the face of a Republican-led federal government, was moved across town to be outside Mr. Trump’s Cipriani fund-raiser. The governor’s office declined until late Friday to confirm that Mr. Cuomo would not attend, even though he had sent the original invitation to party activists.
What had begun so promisingly on Monday as the first real breakthrough in years had quickly given voice to the familiar bickering and backbiting that has come to define dysfunctional Democratic politics in the state.
The governor — a deal-making centrist, proud of his pragmatism — said that it was impossible to please all the people, all the time.
“It’s about unifying the Democrats, not universal political support by everyone,” Mr. Cuomo said in a phone interview late Friday. “It’s as close to peace in the Middle East as you can get.”
Some of the activists on the left seem intent on punishing the I.D.C. members for their nearly seven-year relationship with the Republicans and want nothing short of complete surrender, highly unlikely while they still hold the keys to the majority.
Phone banking against I.D.C. candidates has also continued this week, as volunteers text and call potential primary voters in their districts, urging them to reject so-called Trump Democrats.
The dissatisfaction stems from a variety of concerns, including the lack of enforcement mechanisms for making good on the promises of unity; the planned timing of the unification, after the all-important budget season in March, allowing Senate Republicans to hold power during that period; and the fact that the I.D.C. had promised to return to the fold before, in 2014.
That time around, the Democrats suffered humiliating losses in the general election, and the I.D.C. returned to working with the G.O.P. And that makes die-hard liberals very wary.
“Talk about déjà vu,” said Zephyr Teachout, who mounted a surprisingly strong Democratic primary challenge to Mr. Cuomo in 2014. “There’s a number of questions here, including whether you should believe it at all.” Ms. Teachout seemed particularly vexed by the idea that Mr. Cuomo wouldn’t call special elections for two soon-to-be empty seats — in usually Democratic districts — until after the budget, leaving the party short-handed.
“It’s one of the most important budgets in New York history at a time when we’re facing a…