The United States is a pretty divided country; which may just feel like an inevitable product of our times. But it turns out there’s one partisan tool, in particular, that bears at least some of the blame. It’s something that is used behind closed doors, and that, thanks to the power of software and data, has turned into an ever more powerful partisan weapon. One that has now gone so far that some are saying it’s subverting democracy. And without any intervention, there’s no reason to think the situation will change for the better. Has our democracy crossed a line? And if it has, what is to be done?