Hillary Clinton did a litmus test in NYC by hitting Broadway and getting encouraging results ... amid rumors she'll run for mayor.
Hillary and Bill hit up a performance of "In Transit" Wednesday night at Circle in the Square Theatre, where the cast and guests gave her a standing O while chanting her name.
By the end of the a capella show, Hillary herself started a standing ovation for the cast ... then went backstage for a meet and greet.
It's pretty clear ... lots of New Yorkers still love her ... maybe enough for her to take on Hizzoner Bill de Blasio in November.
New York: if you can make it there ...