Andrew Cuomo stepped down as New York’s governor amid a barrage of sexual harassment allegations and a chorus of other Democrats demanding his resignation.

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 an extraordinary about-face, back-of-the-pack mayoral candidate Jessica Ramos is endorsing her front-running rival Andrew Cuomo — just weeks after questioning his “mental acuity”