A conspicuous loser along with Mr. Trump was his former chief White House political strategist Steve Bannon. As head of the ultra-nationalist Breitbart News website, he went personally to Alabama, spoke for Mr. Moore and touted his candidacy online. It amounted to a continuation of Mr. Bannon's campaign to wrest control of the Republican Party from the old party establishment that has already been rendered politically impotent by its own ineptness in the era of Mr. Trump.