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Great political change often begins with the smallest of doubts. Such a doubt is beginning to make itself heard in the US presidential campaign. Free trade, Hillary Clinton is saying, may not be so great after all. Could it signal the beginning of the end for globalization?

It was the Chinese philosopher Lao Tzu who said, "A journey of a thousand miles begins with a single step." The same can be said of political movements. In their embryonic state, they are often little more than doubts tugging at the corners of a political heart. The Cold War provides a ready example: Growing skepticism with the policy of confrontation eventually gave rise to détente.