Joe Miller, Alaska’s Republican nominee for the United States Senate, recently expressed support for an idea that is rapidly gaining steam in Tea Party circles: the repeal of the Seventeenth Amendment. Miller subsequently backtracked from his statement, but he shouldn’t have: Repealing the Seventeenth Amendment would go a long way toward restoring federalism and frustrating special-interest influence over Washington. Ratified in 1913, the Seventeenth Amendment replaced the election of U.S. senators by state legislators with the current system of direct election by the people. By securing the Seventeenth Amendment’s ratification, progressives dealt a blow to the Framers’ vision of the...