Like plenty of other cable news talk-show hosts, Greta Van Susteren anchored a segment on her top-rated Fox News show Tuesday assessing, among other things, the future of Herman Cain’s presidential candidacy in the wake of the allegation that Cain had a 13-year affair with a woman from Atlanta. But unlike plenty of other cable news talk-show hosts, Van Susteren had an important relationship to the story, and to the Cain campaign. Her husband–prominent Washington lawyer John Coale–is now acting as an adviser to Cain. Van Susteren did not disclose her husband’s relationship to Cain on the air, opting instead...