Two federal court rulings in 2010 paved the way for the ascent of “super PACs,” political action committees that can raise and spend unlimited amounts of money on political races, as long as they don’t coordinate with a specific candidate. And so far, they’re spending heavily on the Republican race. This app, part of our long-term investigation into "dark money," keeps track of where super PACs are spending and raising their cash to influence the presidential race.