Democratic former Sen. Tom Duane on Friday formally endorsed Vermont U.S. Sen. Bernie Sanders’s presidential campaign, joining a growing slate of New York liberals who are backing the insurgent candidate’s White House bid over Hillary Clinton.

“Bernie Sanders is giving voice to people who are pushed aside and left out in a democracy where increasingly only the rich and powerful matter. He’s mobilizing unprecedented enthusiasm, and he’s doing it by telling the truth, just as he has for his entire career. I am excited to have the opportunity to endorse Bernie Sanders, because I have long admired him. I know there are deep wells of support for Senator Sanders among progressive voters across New York. I hope my endorsement will make it a little easier for other progressive leaders to join the campaign as well.”

Duane first made his intentions to endorse Sanders to NY1’s Zack Fink.

Dunae, a former lawmaker representing Manhattan, was first elected to the Senate in 1999, is the second openly gay member of the Legislature and was instrumental in the push for the legalization of same-sex marriage in 2011.

Duane retired in 2012, and was replaced in the chamber by Democratic Sen. Brad Hoylman.

His endorsement caps an endorsement spree for Sanders in New York from leading liberal organizations and labor unions, including the Working Families Party, Citizen Action and the Communications Workers of America.