First-term Assemblyman Juan Ardila may be the incumbent, but few gave him much of a chance in Tuesday’s primary.

A sexual misconduct scandal that surfaced last year made him an outcast in the Democratic Party and wrecked his chances for reelection.

Instead, it was union organizer Claire Valdez who prevailed in the three-way race in the 37th Assembly District in western Queens, which covers parts of Long Island City, Sunnyside, Maspeth and Ridgewood.

“Last night was a huge victory,” Valdez said.

Valdez won the support of the party’s progressive wing, including elected officials like Rep. Alexandria Ocasio-Cortez, who had supported Ardila two years ago. Valdez was also backed by the Democratic Socialists of America, or DSA.

“I think what we did in this race is prove that there is a wide constituency for what DSA stands for,” Valdez said, “Which is, again, universal programs, universal child care, healthcare for everyone, housing for everyone, taxing the rich to fund these essentially programs that we all rely on.”

It was otherwise a clean sweep Tuesday for incumbent state lawmakers facing primary contests, including Queens Assemblyman Ron Kim. Assemblymembers Stefani Zinerman of Brooklyn and Michael Benedetto of the Bronx fended off challengers backed by the DSA, which had also supported Rep. Jamaal Bowman.

But DSA-backed incumbents also performed well, including Brooklyn Assemblywoman Emily Gallagher.

As for Ardila, he initially apologized after two women accused him of having made unwanted sexual advances at a party in 2015.

But he also denied the allegations and resisted calls for his resignation. He mounted a low-key reelection campaign, but raised little money and avoided the press.

“Support just disappeared,” Valdez said. “And I think when people saw that they had other candidates to choose from, they made different choices. He really didn’t run much of a campaign at all, and to be honest, wasn’t much of a factor in this race, I don’t think.”