wilwheaton:

“The congressional party is controlled and run by the hard right minority variously called the Tea Party or Freedom Caucus. But they are a bit too hot for national public consumption. They also rely on the idea that their far right policy agenda has broad public support but is held back by a corrupt/bureaucratic establishment. For both of these reasons a system was developed in which this far right group runs the caucus, but from the background, while it is nominally run by a mainstreamish Republican leader. Under John Boehner, Paul Ryan or Kevin McCarthy this basic dynamic remained more or less the same. It works for everybody because the Freedom Party calls the shots while the party maintains broad electoral viability via figureheadish leadership.”

— No Plans To Veer From The McCarthy Punishment Playbook