All it took was a single-page resolution for the congressman Matt Gaetz, a hard-right Republican from Florida, to set in motion a move unprecedented in Congressional history: the ousting of a House speaker. On Tuesday, a handful of conservative rebels joined Gaetz in voting to depose Kevin McCarthy, the Republican speaker. By a vote of 216-210, the effort succeeded, plunging the Republican-controlled House once again into chaos and cementing Gaetz’s position as one of Capitol Hill’s chief antagonists. It has also brought renewed media attention to a controversial politician who thrives on it. “Florida Man. Built for Battle,” reads Gaetz’s...