From the Morning Memo:

Tiffany Cabán’s apparent victory in the Democratic nomination contest for Queens district attorney was perhaps entirely predictable given the gaining strength of the progressive moment in New York.

Taken over the last year — victories by Rep. Alexandria Ocasio-Cortez, the unseating of members of the Independent Democratic Conference in the fall and now Cabán’s win — is part of a broader trend for New York progressives: There’s a gradual shift in the state’s politics.

Gov. Andrew Cuomo at a news conference on Wednesday diagnosed the issue as one of turnout, which is especially low in primaries that for the first time on the local level are taking place in June.

But he also acknowledged there is a new force on the left.

“There is no doubt a political force — a dynamic change,” Cuomo said. “Change for the sake of change. I’m unhappy, so I want change. The question is who votes? Who votes, right? I won election last year with the greatest number of votes in the primary in history, with the greatest number of votes in history. I was not change on a simplistic level, I was running for re-election.”

There is, of course, still the matter of scale of running statewide and Cuomo remains able to hold a coalition of upstate and suburban Democrats and black voters.

The gradualism is easy to spot: local districts fall to progressives, then a borough-wide office. What’s next for the left? It’s easy to imagine the left mounting a credible candidate for New York City mayor in 2021 — someone who like Cabán six months ago is still an unknown.

Being associated with the establishment at this point can be seen more as a liability. If you want to be mayor of New York after Bill de Blasio is gone, your calculus is changing day to day.