The truth behind the rumor-mongering, however, is a little more complex. A half-dozen GOP operatives and media figures tell The Daily Beast that Cruz’s opponents have been pushing charges of adultery for at least six months now—and that allies of former GOP presidential hopeful Marco Rubio were involved in spreading the smears. For months and months, anti-Cruz operatives have pitched a variety of #CruzSexScandal stories to a host of prominent national publications, according to Republican operatives and media figures. The New York Times, The Washington Post, Bloomberg News, Politico, and ABC News—reporters at all those outlets heard some version of...