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As hard as it is today to amend the United States Constitution — and empirical studies confirm that it is one of the hardest democratic constitutions to amend, if not the hardest, in the entire world — the United States Constitution was once thought too easy to amend. During the Progressive Era, a period of social activism and institutional reform from the 1890s through the 1920s, the United States adopted four constitutional amendments in a short span of roughly 10 years: the Sixteenth Amendment, authorizing a direct income tax; the Seventeenth Amendment, establishing direct elections to the United States Senate; the Eighteenth Amendment, imposing prohibition; and the Nineteenth Amendment, constitutionalizing women’s suffrage. In this Essay prepared for a conference on corruption and institutional design in comparative perspective, I explore the impetus for the Seventeenth Amendment, which was in large measure driven by an effort to curb corruption in senatorial elections. Today, roughly one hundred years since the entrenchment of the Seventeenth Amendment, there appears to be some support to repeal it. The challenge, however, is that it is much harder today than before to formally amend the Constitution.