American politics is in trouble. A tsunami of unaccountable, untraceable political money is overwhelming the Republican race for the presidential nomination and threatens to do the same to the fall election. For many people, especially progressives, the culprit is easy to name: the Supreme Court’s 2010 decision in Citizens United v. Federal Election Commission, which swept away any limits on election-advocacy ads by corporations, unions, and “independent” political-action committees (PACs) and issue groups. Many progressives believe that Citizens United “made corporations people” and that a constitutional amendment restricting “corporate personhood” will cure this political ill.