State Sen. Jessica Ramos turned her back on fellow progressive mayoral candidates Friday — making the shocking move to endorse frontrunner Andrew Cuomo despite previously questioning his mental acuity.

As the race for NYC mayor heats up, Andrew Cuomo and fellow candidate New York State Sen. Jessica Ramos are expected to announce a ranked choice voting alliance Friday.

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”