Kenneth Vogel and Hadas Gold write in Politico about the latest trouble to strike Glenn Beck’s media empire, as Beck and one of his advertisers sue each other over unpaid bills and claims that the radio talker’s endorsement of Ted Cruz’s presidential campaign and increasingly shrill denunciations of Donald Trump alienated his audience. Politico notes that Beck’s diminished relevance is juxtaposed by the rising influence of Breitbart News, which — along with Matt Drudge, Sarah Palin, and Sean Hannity — Beck has repeatedly attacked during this election cycle.