Conservatism is not, as the aristocratic interpretation argues, the monopoly of one particular class in history. Nor is it, as the autonomous school contends, appropriate in every age and place. It is, instead, relevant in a particular type of historical situation. That is the situation in which American liberalism finds itself today. Until the challenge of communism and the Soviet Union is eliminated or neutralized, a major aim of American liberals must be to preserve what they have created. This is a limited goal but a necessary one. Conservatism does not ask ultimate questions and hence does not give final answers. But it does remind men of the institutional prerequisites of social order. And when these prerequisites are threatened, conservatism is not only appropriate, it is essential. In preserving the achievements of American liberalism, American liberals have no recourse but to turn to conservatism. For them especially, conservative ideology has a place in America today.
(Samuel P. Huntington, "Conservatism as an Ideology," The American Political Science Review 51 [June 1957]: 454-73, at 473)
Note from KBJ: Today's threats are progressivism and Islamism. See here.