Last August left little doubt that a conservative revival was underway. Constituents packed town-hall meetings across the country to confront Democratic House members and senators ill-prepared to explain why, in the teeth of a historic economic downturn and nearly 10% employment, President Obama and his party were pressing ahead with costly health-care legislation instead of reining in spending, cutting the deficit and spurring economic growth.

Still, whether that revival would have staying power was very much open to question. A year later—and notwithstanding the Democrats’ steadily declining poll numbers and the mounting electoral momentum that could well produce a Republican majority in the House and a substantial swing in the Senate—it still is.

Sustaining the revival depends on the ability of GOP leaders, office-holders and candidates to harness the extraordinary upsurge of popular opposition to Mr. Obama’s aggressive progressivism. Our constitutional tradition provides enduring principles that should guide them.

In late 2008 and early 2009, in the wake of Mr. Obama’s meteoric ascent, the idea that conservatism would enjoy any sort of revival in the summer of 2009 would have seemed to demoralized conservatives too much to hope for. To leading lights on the left, it would have appeared absolutely outlandish.

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