More than a decade ago, before the post-9/11 national fervor set in, Walter Russell Mead published an insightful essay on the persistent "Jacksonian tradition" in American society. Jacksonians, he argued, embrace a distinctive code, whose key tenets include self-reliance, individualism, loyalty and courage.

Jacksonians care as passionately about the Second Amendment as Jeffersonians do about the First. They are suspicious of federal power, skeptical about do-gooding at home and abroad; they oppose federal taxes but...