Conservatives might be well advised to read George F. Will's most recent pessimistic column, which starts out:
Looking on the bright side, perhaps this election can teach conservatives to look on the dark side. They need a talent for pessimism, recognizing the signs that whatever remains of American exceptionalism does not immunize this nation from decay, to which all regimes are susceptible.
Will goes on to discuss his point at length, noting, I think, of interest:
Nothing lasts. If Trump wins, the GOP ends as a vehicle for conservatism. And a political idea without a political party is an orphan in an indifferent world.
I'd note that, at least in my view, the situation for liberalism, in a true sense, isn't much better.