Greta Van Susteren, who has hosted a top-rated evening program at Fox News for 14 years, is leaving the network. The abrupt announcement today, in the middle of the presidential campaign, was coupled with word that Brit Hume, Fox’s senior political analyst and a former Washington managing editor, will take over as host of “On the Record” through the election. Hume said he is “happy to take on this assignment for the balance of this extraordinary election. My Fox News colleagues have set a high standard for political coverage which I’ll do my best to uphold. I’m honored to be...