acd77bc5ca1a42e49b94afbe26f3e949/Katie Couric, John Molner
FILE - Katie Couric arrives at the Vanity Fair Oscar Party on Sunday, Feb. 26, 2017, in Beverly Hills, Calif. Mark Harvey, a professor at the University of Saint Mary and author of “Celebrity Influence: Politics, Persuasion, and Issue-based Advocacy,” says a celebrity's personal connection to an issue can matter. “Today” show host Katie Couric got a colonoscopy on air in 2000 after her husband died from colon cancer, and spurred a major spike in the procedure months that followed. (Photo by Evan Agostini/Invision/AP, File) FILE PHOTO; 022617118792