University of Chicago Photographic Archive, Special Collections Research Center, University of Chicago Library

At a televised Democratic candidate forum Friday, MSNBC host Rachel Maddow showed Bernie Sanders a black-and-white photo of a man with his face turned away from the camera speaking before a civil rights protest. “This is you in 1962,” Maddow said to the Vermont senator.

“Who is that handsome young guy with the dark hair?” joked Sanders. The audience laughed.

There was just one problem: Four University of Chicago alumni who went to school with Sanders tell TIME they believe that the dramatic photo of Sanders, which his campaign has featured on its website and in a promotional video, is not in fact a photograph of Sanders. An archivist at the University of Chicago agreed in January that Sanders was not the speaker in the photo, though the school’s official decision on the man’s identity is still pending.