Another day, another key endorsement headed the way of Cherelle Parker.

The Philadelphia mayoral candidate picked up the support of Local 32BJ of the Service Employees International Union, a major political spender in East Coast municipal elections that represents 12,000 workers in Philadelphia.

The endorsement follows on the heels of the announcement by the Philadelphia Building Trades Council, a coalition of more than 30 construction-industry unions.

“I’ve worked closely with this union for years and I am incredibly honored to have this diverse coalition beside me on the trail as I embark on this journey to City Hall!,” tweeted Parker. “There’s no one else I’d rather have in this fight with me.”

SEIU 32BJ, which is based in New York City and has 175,000 members overall, primarily represents low-wage workers in property services, such as cleaners, security officers, and facilities workers in city schools and the Philadelphia International Airport.

”Cherelle has stood side by side with members in our fight for fair contracts, workers rights, and good public schools,” Daisy Cruz, the union’s district leader for the Mid-Atlantic region, said in a statement. “She is a part of our community and understands the needs and challenges of working people.”

With a more diverse membership than the building trades, SEIU 32BJ often backs left-wing Democratic candidates or funds progressive political organizations like the Working Families Party (WFP).

Parker does not fit that mold, and the WFP has placed its support with former Councilmember Helen Gym in the mayor’s chase.

“We are the birthplace of this nation and we are at a crossroads right now,” said Parker recently. ”But we need strong leadership and we need someone who is not going to be thinking about what’s popular, what the sound bite is, but somebody who’s demonstrated that they know how to lead.”

Endorsements from SEIU 32BJ and the Building Trades Council were part of outgoing Mayor Jim Kenney’s winning formula in 2015 – the last open mayor’s race. But Parker is competing in a larger field of candidates, some of whom have won other major labor endorsements that helped propel Kenney eight years ago.

The Philadelphia Federation of Teachers endorsed Gym, and the largest union of city workers, District Council 33 of the American Federation of State, County and Municipal Employees, backed grocer Jeff Brown.

The winner of May’s Democratic primary is likely to become Philadelphia’s 100th mayor. Given past turnout numbers for an odd-year primary, a lead of 10,000 to 15,000 votes could boost a candidate to a de facto overall victory.