Missouri’s senior U.S. Senator, Claire McCaskill, was among the dozens of other elected officials, comedians, singers, actors, and a couple of Muppets on the finale of Comedy Central’s “The Colbert Report” last night.

The show, centered on a fictional conservative anchorman played by Stephen Colbert, is ending its 9-year run. Colbert is about to become the host of the Late Show after David Letterman leaves in May.

McCaskill and the other guests sang “We’ll Meet Again” in one of the show’s final segments. She had been a guest on the program at least twice.

Along with a picture, McCaskill tweeted, “So much fun to be a part of an amazing group asked by [Colbert] to sing him off his last show. Gonna miss that jerk.”