Something like this happened once before: In the 1960s and 1970s, the culture shifted decisively leftward, but American voters shifted to the right and answered a cultural revolution with a political Thermidor.
That Nixon-Reagan rightward shift did not repeal the 1960s or push the counterculture back to a beatnik-hippie fringe. But it did leave liberalism in a curious place throughout the 1980s: atop the commanding heights of culture yet often impotent in Washington, D.C.
By nominating a Trump rather than a Nixon or a Reagan, the Republicans may have saved liberalism from repeating that trajectory. But it remains an advantage for the G.O.P., and a liability for the Democratic Party, that the new cultural orthodoxy is sufficiently stifling to leave many Americans looking to the voting booth as a way to register dissent.