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Ben Affleck testified before the Senate on Thursday about his philanthropic efforts in the Democratic Republic of the Congo — but during the serious testimony, he also hinted that Vermont Sen. Patrick Leahy has a role in his upcoming “Batman v Superman: Dawn of Justice.”

“I would be remiss if I did not acknowledge my co-star in ‘Batman,’” Affleck told the Appropriations Subcommittee on State, Foreign Operations and Related Programs, referencing Leahy. “[Your] role is marginally smaller than mine, but I understand that you are quite good.”

Leahy’s a major Batman fan who’s appeared in three of the superhero films, including “Batman & Robin” with George Clooney and “The Dark Knight Rises” with Christian Bale. (The pol’s tiny roles included “Board Member #2,” and he’s even voiced a character in an animated Batman series.)

Affleck was at the Senate along with Bill Gates to testify about public-private partnerships benefitting the Congo. He founded Eastern Congo Initiative, which is about to launch a program to aid 15,000 farm families there.