Mayor de Blasio has not made an endorsement in the Harlem congressional race, but one of the Mayor’s early backers last year is throwing its support behind one of Congressman Charles Rangel’s opponents.

In a press release, the group New York Communities for Change endorsed Pastor Michael Walrond.

To make its point about being close to de Blasio, the group gave its announcement the not-so-subtle headline: “Powerful Community Group and de Blasio Supporter Endorses Walrond for Congress from the 13th District.”

The organization cited Walrond’s support for de Blasio’s decision to block a powerful charter school from sharing space with a traditional Harlem public school as one of the reasons for its endorsement.

The endorsement comes a day before Walrond will debate Rangel and State Senator Adriano Espaillat for the first time. The event is being held at the Abyssinian Baptist Church.

In recent days, Rangel has been trying to bolster his institutional support, with endorsements from Senator Charles Schumer and House Minority Leader Nancy Pelosi.