A report from the House ethics committee regarding the investigation of a California congressman was made available on a file-sharing network and reporters from The Washington Post, among others, were able to access it. The report was disclosed inadvertently by a junior committee staff member, who had apparently stored the file on a home computer with peer-to-peer software, congressional sources said. The situation has brought to the fore concerns about the way that sensitive documents and personal data are handled in Congress.
Source: https://threatpost.com/congress-calls-internal-security-review-110209/72985/