But temperamental conservatives are suspicious of the idea of settling issues on the basis of abstract truth. These kinds of conservatives hold that moral laws emerge through deliberation and practice and that if legislation is going to be passed that slows medical progress, it shouldn’t be on the basis of abstract theological orthodoxy.

Over the past four decades, free market conservatives within the Republican Party have put freedom at the center of their political philosophy. But the dispositional conservative puts legitimate authority at the center. So while recent conservative ideology sees government as a threat to freedom, the temperamental conservative believes government is like fire — useful when used legitimately, but dangerous when not.

Over the past few decades, the Republican Party has championed a series of reforms designed to devolve power to the individual, through tax cuts, private pensions and medical accounts. The temperamental conservative does not see a nation composed of individuals who should be given maximum liberty to make choices. Instead, the individual is a part of a social organism and thrives only within the attachments to family, community and nation that precede choice.

Therefore, the temperamental conservative values social cohesion alongside individual freedom and worries that too much individualism, too much segmentation, too much tension between races and groups will tear the underlying unity on which all else depends. Without unity, the police are regarded as alien powers, the country will fracture under the strain of war and the economy will be undermined by lack of social trust.

To put it bluntly, over the past several years, the G.O.P. has made ideological choices that offend conservatism’s Burkean roots. This may seem like an airy-fairy thing that does nothing more than provoke a few dissenting columns from William F. Buckley, George F. Will and Andrew Sullivan. But suburban, Midwestern and many business voters are dispositional conservatives more than creedal conservatives. They care about order, prudence and balanced budgets more than transformational leadership and perpetual tax cuts. It is among these groups that G.O.P. support is collapsing.

American conservatism will never be just dispositional conservatism. America is a creedal nation. But American conservatism is only successful when it’s in tension — when the ambition of its creeds is restrained by the caution of its Burkean roots.