The Working Families Party on Saturday endorsed Cynthia Nixon for governor over incumbent Democrat Andrew Cuomo, highlighting a broader fissure among liberals in New York, activist groups and the union movement.

Nixon, an actress and advocate for public education, received more than 90 percent of the weighted vote alongside New York City Councilman Jumaane Williams, who is running for lieutenant governor.

Neither Nixon or Williams would commit to staying on the WFP’s ballot line in November should they lose their Democratic primaries against Cuomo and Lt. Gov. Kathy Hochul. At the same time, they also would not commit to running as a joint ticket, at least informally during the primary.

The development came after 48 hours of labor unions formally affiliated with the WFP pulling their support from the party, including 32BJSEIU and the Communications Workers of America. Labor leaders formally affiliated with the WFP have also mulled forming their own ballot line that would likely endorse their ally, the governor. Those unions are also likely to yank their support for a constellation of activist groups that have worked with the WFP over the years and have been critical of Cuomo.

“Our friends are in a tough spot and we respect their decision,” said WFP State Director Bill Lipton after the WFP’s meeting at a hotel in downtown Albany, where tea and coffee were served alongside brownies and chocolate chip cookies.

Williams came with a response after winning the WFP endorsement: “Anyone who says they don’t want the Working Families Party endorsement is not a true progressive.”

The move to endorse Nixon and Williams is a cross-the-Rubicon moment for the party that has sought to raise progressive issues in New York over the last several decades and has sought to branch out into other parts of the country.

Cuomo’s campaign on the eve of the vote announced it would drop its push to win the party’s endorsement, citing the split between labor unions and activists. Before the WFP meeting on Saturday, labor leaders who back Cuomo and have left the WFP released statements critical of the party.

“The WFP was a good concept. Unfortunately, it was never allowed to become what it was supposed to be, because the agenda was always driven by the so-called progressives running the staff,” said Mike McGuire, the director of the Mason Tenders District Council PAC and a founding WFP member who left the party.

“In hindsight, it’s easy to see the whole thing was just a scam, a cynical ploy to drive a radical agenda using the muscle and money of organized labor while widely ignoring the actual concerns of New York’s working people. It’s no wonder that they now want to be the disruptors, that the last thing they want to see is Democratic unity at a time when we need it most.”

Nixon, for her part, said she was “thrilled” to receive the WFP’s nod, saying Cuomo has failed to transform the state into a beacon for liberals, especially in the era of President Donald Trump.

“The last eight years of Andrew Cuomo have been living with disappointment, dysfunction and dishonesty,” she said.

Four years ago, the party mulled an endorsement of Zephyr Teachout, a little-known Fordham Law School professor, over Cuomo, who had been criticized by liberals on issues like hydrofracking and being lukewarm on increasing the minimum wage. After winning a second term, Cuomo banned fracking in the state and won the passage of bill that would eventually increase the state’s minimum wage to $15 in the New York City area.

Still, liberals have remained skeptical, especially when it comes to Cuomo’s alliance with Senate Republicans and the eight-member Independent Democratic Conference.

This month, Cuomo negotiated a truce between the mainline conference of Democrats in the state Senate and the IDC, leading to the breakaway Democrats to return to the fold. Cuomo has also pushed for two Democrats to win open Senate seats in an April 24 special election, giving the party a numeric majority potentially in the Senate.

Nevertheless, the moves have been too little, too late for liberal activists who are backing Nixon’s campaign for governor.

Cuomo continues to enjoy advantages ahead of the primary in September, including leads in polls of Democrats, self-identified liberals and union households.

There was a very different reception for Cuomo at the Democratic Rural Conference on Friday evening, where Cuomo spoke behind closed doors to a group upstate Democrats who have historically supported him, including in 2002 during his first failed bid for governor.

“I think the folks that have chosen to breakaway are looking increasingly isolated,” said Rep. Sean Patrick Maloney. “I think what you are seeing is real enthusiasm from progressives for this governor. Look, the guy’s a rock star. When you look at the things he’s done for upstate, it’s really impressive.”

Maloney said there was a “silent majority” of liberals who will support the governor in a Democratic primary. Maloney added that he plans to run on the WFP’s ballot line this fall.