“Excited” would not have been the best word to describe the mayor’s demeanor as he took the stage after the governor, but “pained” would not be quite right either.

Pragmatic, perhaps. Decently convincing.

“I’ve known Andrew Cuomo almost a quarter century. And this may surprise you: From time to time, we have disagreements. I know it seems unlikely,” Mr. de Blasio said, to laughs from the crowd of elected officials and union members. But, he continued, “you can also understand there’s a greater good.”

Mr. Cuomo, too, offered his share of uncharacteristic praise, introducing Mr. de Blasio as “the great mayor of the City of New York.”

Of course, that did not mean that the two men were not going to swipe at each other in subtle ways.

[Why do the governor and mayor persist in feuding with each other? We have reasons. Read more here.]

Mr. Cuomo, as usual, dedicated most of his speech to attacking President Trump, but not before taking a moment to sneer again at the “genius pundits” who had predicted a low turnout, or the “theoretical or abstract” ideas about the definition of progressive government. It was the same tone he had adopted the day after the primary, when he dismissed the so-called progressive wave that Ms. Nixon’s allies had predicted would take him down; and it was the same attack he has repeatedly lobbed at Mr. de Blasio, an idealist compared to Mr. Cuomo and his more centrist pragmatism.