How Right-Wing Media Ate the Republican Party

In recent weeks, America got a preview of how the new Republican House majority would wield its power. In attempting to perform a basic function of government — electing a speaker — a coalition of 20 House members caused Kevin McCarthy to lose 14 rounds of votes, decreasing his power with each compromise and successive vote.

This is not normal. Party unity ebbs and flows, but the G.O.P. in recent decades has come apart at the seams. Nicole Hemmer is the director of the Carolyn T. and Robert M. Rogers Center for...