In November, Montana voters will weigh a ballot measure seeking to curtail corporate money in elections — a democratic assertion of popular will that runs headlong into a constitutional order shaped by the Supreme Court's Citizens United decision. The measure targets so-called dark money, the largely undisclosed corporate spending that critics say distorts the voices of ordinary citizens. Whether or not it survives legal challenge, the vote itself is a referendum on a deeper question that has unsettled American democracy for over a decade: who, ultimately, gets to decide how power and money sp