Jeff Bezos’ personal security team has launched an investigation into how his text messages ended up in The National Enquirer, and the inquiry is increasingly convinced that political motives are behind the disclosure. The investigation is taking place independent of Amazon, and Bezos, the world’s richest man, is personally funding it. Investigators want to know who leaked the texts that publicly blew up Bezos’ marriage earlier this month by revealing, in lurid detail, his affair with Los Angeles news anchor Lauren Sanchez. The leaked text messages contained flowery missives from Bezos such as “I want to smell you, I want...