The endorsement would give Espinal significant Get-Out-The-Vote forces on election day, slated for September 13.
The endorsement is not yet official, and Espinal declined comment.
The race to replace Darryl Towns in the Assembly has taken on unusual significance, and is seen as a proxy battle for various powerbrokers in the neighborhood: Congressman Ed Towns, Brooklyn Democratic leader Vito Lopez, and labor interests aligned with the Working Families Party.
Espinal, a staffer for City Councilman Erik Dilan, is close to Lopez.
Espinal also announced today that he was endorsed by the Teamsters Union.
In other news, Jesus Gonzalez, who is backed by the WFP, has been racking up endorsements from local political clubs, having Lambda and Democracy for New York City over the last couple of weeks.
Deirdra Towns, the daughter of Congressman Towns, is also in the race.
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