The movie "All the President's Men" tells the true story of how intrepid reporters broke the Watergate Scandal that ultimately sank the presidency of Richard Nixon back in the 1970s. The source of the most damning leads was a person identified at the time only as "Deep Throat." And a single Deep Throat line from the movie has since become a common idiom in American culture. "Follow the money."
In the context of the Watergate affair, money purportedly was the paper trail that allowed the reporters to get to the heart of the corruption that infected the Nixon White House. And while money is often the driving force behind a lot of questionable activities in government, it isn't the only paper that's important in resolving issues.