U.S. Sen. Chuck Schumer on Tuesday became the highest-profile endorser yet for Rep. Charlie Rangel’s re-election bid for the Harlem congressional seat he has held since 1971.

“I’ve had the honor of serving with Congressman Charles Rangel in Congress for over thirty years,” Schumer said in a statement released by Rangel’s campaign. “Throughout his tenure, he has proven to be a tenacious fighter who is committed to improving the lives of his constituents – and someone who has delivered results. As the Dean of the New York Congressional Delegation, he has been an effective, progressive leader on issues like the minimum wage, health care and immigration reform and he’s not done fighting. I’m proud to support Charlie for reelection – he’s the clear choice to keeping standing up for everyday New Yorkers.”

Rangel again faces state Sen. Adriano Espaillat in a June primary.

Espaillat narrowly lost to Rangel in 2012, but his falling within striking distance of the longtime incumbent was seen as a sign of the changing demographics of the seat, which had been redrawn by a federal judge that year during re-apportionment.

Also in the primary is the Rev. Michael Walrond, an associate of the Rev. Al Sharpton.

“I’m so proud to be endorsed by our senior Senator Chuck Schumer, whose commitment to fighting for the people of New York has made him one of the most effective elected officials in our state’s history,” Rangel said in the announcement this morning. “From giving a voice to all New Yorkers to standing up to injustice wherever it exists, Senator Schumer has been an incredible leader and an outstanding partner in Congress. I look forward to working closely with him over the next two years to deliver results for the people of the 13th District.”