The U.S. Supreme Court has agreed to hear arguments in a case that could challenge its controversial Citizens United ruling. The 2010 decision opened the floodgates for unlimited corporate spending on election campaigns by casting political spending by corporations as free speech. Now, the Supreme Court will review a Montana Supreme Court decision that upheld restrictions on corporate election spending in that state. Supreme Court Justice Ruth Bader Ginsburg wrote last month that the case “will give the court an opportunity to consider whether, in light of the huge sums currently deployed to buy candidates’ allegiance, Citizens United should continue to hold sway.”