We live in an era of unusual political polarization, but the polarization isn’t simply between the two parties; there are also splits within them.

Last week the Republican Party’s divisions were on display, when Speaker of the House John A. Boehner — who helped his party gain its largest majority since the Truman administration — faced an uprising. The revolt was led by conservatives against a man whose voting record is unquestionably conservative. It was another indication that the tension on the right these days is not about policy or ideology but tone and temperament.