Nassau State Supreme Court Justice Michele Woodard, who was not renominated by county Democrats, will be on the Nov. 4 ballot on the Working Families and Independence parties, officials said.
Working Families spokesman Joe Dinkin said the party had endorsed Woodard, while state Independence chairman Frank McKay said: "We're very proud to have her on the line. She got 100 percent of our convention."
"I feel very positive and very happy at the double opportunity to reach the people," said Woodard. "I am going to work really hard until Nov. 4, and then, after that, I'm going to work very hard for the next 14 years [of the new term]."
Woodard, 59, of Westbury, had run five times as a Liberal Party candidate, winning the sixth time in 2000 with the cross endorsement of the Democrats.
She was the first African-American ever elected to state Supreme Court on Long Island.
Before winning the seat, she had spent 12 years as a New York State assistant attorney general.
The Liberal Party no longer exists, and this year Democratic leaders rejected Woodard and made a deal with Republicans to cross endorse each other's judicial candidates this year and next.
Nassau Democratic leader Jay Jacobs said the party didn't endorse Woodard because she did not attempt to register as a Democrat until this year, and that the GOP would not cross endorse her in any event. Some black leaders criticized Jacobs' actions.
Woodard is married and has an adult son and daughter.