The five-member Independent Democratic Conference would grow by one should Marisol Alcantara win the race to succeed state Sen. Adriano Espaillat.

Sources confirmed this week Alcantara, a labor organizer, would join the conference if elected. Alcantara this week was endorsed by the IDC, led by Sen. Jeff Klein, a Bronx Democrat.

In a statement, Alcantara praised the IDC on a variety of policies the conference has pushed, including paid family leave and universal pre-Kindergarten.

“For 20 years, I have been working in the trenches in Albany on behalf of organized labor to bring about progressive legislation,” Alcantara said in a statement.

“I witnessed an increase in the minimum wage twice, paid family leave, and Universal Pre-K for NYC–all possible because of the IDC’s influence. When I am elected I look forward to going to Albany to continue to push for progressive legislation critical to the people of the 31st district.”

Alcantara joining the ranks of the IDC would be a key step for the conference to bolster their clout in Albany heading into the 2017 legislative session. Senate Republicans hold a narrow majority in the chamber, while Democrats expect to do well in suburban and upstate swing districts with Hillary Clinton atop the party’s ticket this year.

The IDC in the past has aligned with Senate Republicans to form a majority coalition, but could forge a similar arrangement with the mainline Democratic conference.

“Anyone who knows me knows that I am and will continue to be a fierce advocate for the progressive policies I’ve fought for my entire life,” Alcantara added.

“And, most importantly, I will be a strong and independent voice for tenants and families throughout the district. I will put my credentials of fighting for progressive causes up against my two opponents any day of the week–one of whom lobbied for a Republican mayor in Albany, and another who paved the way for an unprecedented third term for a Republican mayor.”

Alcantara next month faces former Eric Schneiderman aide Micah Lasher and former city Councilman Robert Jackson in a primary.