Mr. de Blasio, for his part, singled out the ouster of the former members of the State Senate’s Independent Democratic Conference, a group of Democrats who had collaborated with Republicans, declaring that he would not miss them at all. Ms. Nixon had accused Mr. Cuomo of enabling the I.D.C.; Mr. Cuomo did not mention the I.D.C. on Tuesday.
Mr. de Blasio’s praise of the governor’s achievements, too, occasionally seemed tepid. While he thanked Mr. Cuomo and his lieutenant governor, Kathy Hochul, for passing paid family leave, he offered a more milquetoast appraisal of passage of a $15 minimum wage: “I appreciate that they got it done.”
And while the mayor sang warm praises for Letitia James, the city’s public advocate and the winner of a four-way primary for attorney general — “I am proud to endorse her,” he said — he never said the word “endorse” for Mr. Cuomo. (Eric Phillips, a spokesman for the mayor, later said the joint appearance Tuesday had indeed been an endorsement.)
Then Mr. de Blasio turned to the topic of Mr. Trump. He recalled that “there were folks in our party who thought about maybe trying to get along with President Trump” after the 2016 election. The mayor did not mention names, but Mr. Cuomo had said after the election that Mr. Trump’s being from New York could prove a “bonus” for the state.
After a pause, the mayor continued: “I want to give Governor Cuomo credit. He locked on and he challenged Donald Trump every step of the way.”
Indeed, Mr. Cuomo has recently made Mr. Trump a favorite rhetorical target, often preferring to speak about him instead of Ms. Nixon during the primary campaign. That seemed unlikely to change for the general election: In his speech Tuesday, Mr. Cuomo called Mr. Trump the “Bernie Madoff” of politics and a fomenter of civil war between red and blue states. He never said the name of his Republican opponent, Marcus Molinaro.
There were other shows of party unity. Robert Jackson, a State Senate candidate who had endorsed Ms. Nixon, attended the rally, as did the City Council speaker, Corey Johnson, who had supported Ms. Nixon’s running mate, Jumaane D. Williams. Ms. James acknowledged her former rivals, noting that the primary had been “bruising,” but said that she would focus on “bridging divides.”