On August 7, the day after Tucker Carlson called America’s white-supremacy problem “a hoax,” the Fox News host announced a weeklong trip “to the wilderness” to fish with his son. Unlike other hosts on the network who’ve come back from vacation to find their airtime filled, Carlson eased back into his routine on Monday with more pedestrian fare, including segments on Joe Biden’s fitness for the presidency and Elizabeth Warren’s Native American misstep. But not all his pre-holiday advertisers joined him upon his return. According to the watchdog group Media Matters for America, in the past 11 days, Tucker Carlson...