The most populated city in the United States might also have the most polarizing mayoral race of any other. The New York City mayoral race features a disgraced former governor, a surging socialist, an incumbent with his own legal troubles,

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.