The decision by Ms. Ramos, a state senator from Queens, is at odds with her frequent criticism of Andrew M. Cuomo, including comments questioning his “mental acuity.”

In the race for New York City mayor, Democratic candidate Jessica Ramos, a state senator from Queens, threw her support to Andrew Cuomo Friday.

Four years ago, a chorus of fellow New York Democrats called on then-Gov. Andrew Cuomo to resign amid sexual harassment allegations. Now, a growing group of them are endorsing him for mayor of New York City.