The broadcast news media has not been kind to President Trump since he was elected. Consistent studies from the Media Research Center showed that, on average, 90 percent of the coverage of Mr. Trump has been hostile. Broadcasters now appear intent on creating a negative grand finale as the midterm elections loom, lashing out at the GOP as well. “The broadcast networks are heavily spinning their campaign coverage against the Republicans. The spin of this coverage was lopsidedly anti-Republican and anti-Trump,” writes Rich Noyes, a senior analyst for the conservative press watchdog. Based on coverage from Sept. 1 through Oct....