Christine Quinn received a major endorsement, but may no longer be the mayoral race front-runner, according to one poll.
One of the city's most powerful unions, the Service Employees International Union Local 32BJ, endorsed the city council speaker's candidacy on Tuesday.
The group represents 75,000 building service workers in the city.
"We are going to make this city a place where you can come here as an immigrant and get into the middle class," Quinn told gathered union members Tuesday.
She has been courting the union for at least a year, shepherding union-supported legislation through the City Council, like the paid sick leave bill and a wage increase for building service workers.
SEIU Local 32BJ was instrumental in pushing both bills, and on Tuesday the union's president, Hector Figueroa, acknowledged paid sick leave was a big boost for Quinn's candidacy.
"I stand really proud that our union was there as part of a legislative victory that the speaker made possible," he said.
Figueroa also said his union would work to rally support for Quinn.
"A thousand members that will be the field leaders of this campaign, we are going to talk to all of the members of 32BJ. We are going to do independent spending," he said.
But Quinn's good news may be clouded by news that she came in second place among Democrats in a Marist College poll commissioned by the Wall Street Journal and NBC News.
The survey shows Anthony Weiner now leads the Democratic field, with the support of 25 percent of registered Democrats, compared to Quinn's 20 percent.
It is Quinn's lowest level of support and the first time she is not leading in the race.
Behind the two front-runners are former City Comptroller William Thompson with 13 percent, Public Advocate Bill de Blasio with 10 percent, City Comptroller John Liu with 8 percent, pastor Erick Salgado with 2 percent and former City Councilman Sal Albanese with 1 percent.
According to the poll, less than one out of five registered Democrats are still undecided.
Just a few months ago, one poll put the speaker at 37 percent, just a few points away from 40 percent and avoiding a runoff entirely. Since Weiner entered the race, Quinn's lead steadily declined.
In a statement, a Quinn campaign spokesperson said come Election Day, voters would pick someone who has demonstrated an ability to lead.