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”

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.

Ramos, who is also running for mayor, says she is staying in the race and will remain on the ballot in order to keep having a voice to advocate for her causes.