Money suffuses our political system. Candidates must spend huge sums to get elected, and once they do, well-funded interests spend huge sums to influence how they vote. Campaign finance laws are being struck down, and money is rushing into outside groups that don’t have to disclose their donors. Some studies have found companies can get as much as a 22,000 percent return on their lobbying dollars, while a recent poll from the Global Strategy Group found that more than 90 percent of Americans wants to reduce the role of money in politics. Here’s what’s going on — in charts, of course.