Because conventional wisdom in Washington says that PACs ARE EVIL, many reporters pore over the lists of contributions to the candidates and ignore how they spend the money. That's a mistake. Although most reporters who use the FEC record room focus on campaign reports filed by congressional and presidential candidates, don't overlook fundraising reports filed by PACs or laws and regulations. Big contributors have often run afoul of federal campaign laws, and you can find out what they did and how the FEC handled it. Correspondence from contributors' attorneys is often included in the public record.
Many companies incorporate in Delaware for tax reasons.
This document lists corporate officers, gross assets and date of incorporation. Congressional Quarterly Inc., Washington, 1992. The Dollar Power of PACs in Congress. Congressional Quarterly Inc. Washington, 1990. Standard and Poor's Register of Corporations, Directors and Executives.