In the latest revealing turn of events, upstart Jackson Lahmeyer, the MAGA-friendly challenger to Oklahoma GOP Senator James Lankford, was endorsed this week by the state’s party chairman, John Bennett. Lankford, a moderate who offered only the most tepid support for Trump, was stunned, telling Tulsa World it is “highly unusual for a state party chair in any state in America to come out and say, ‘I’m not going to at least be neutral.’” While this may seem a minor development, it speaks volumes about the unambiguous preferences of the party base. And major media, far from minimizing this defining...