WaPo, grossly underestimating Boehner's achievement, calls Boehner's opponents in Congress "conservatives" but what they are is ideologues, fanatics for whom anything less than everything they demand is unacceptable, and for whom the good is the enemy of the perfect, here:
"Boehner could never please his most conservative members. Fiscal deals negotiated with President Obama produced more than $2 trillion in savings and made the GOP’s tax cuts permanent for 99 percent of workers, but the far right painted both deals as sellouts."