On June 20, 2007, then-Sen. Barack Obama (D.-Ill.), who was seeking the Democratic presidential nomination at the time, hosted a “portrait session” in his U.S. Senate office where he posed for and with Terry Richardson, a man already well-known, as the flyleaf of a coffee-table collection of his work put it, as the photographer who “took 1970s porn aesthetic and made it fashion chic.” … Vibe’s September 2007 issue used six of the photos Richardson took of Obama that day. The magazine had two versions with different covers. One cover featured Obama with his tie loosened and his jacket off,...