What hope is there for progress in such an environment — for a way out of the gridlock that frustrates so many Americans? The temptation is to summon a “revolution,” as her chief primary opponent imagined, or promise to blow up the system, as Mr. Trump posits. Both temptations are dead ends, as Ms. Clinton understands. If progress is possible, it will be incremental and achieved with input from members of both parties. Eloquence and charm may matter less than policy chops and persistence.