WHAT IF members of Congress were seated not by party but according to their major business sponsors? We gave it a try—and then kept crunching the numbers to find the top 75 corporate spenders of all time, this year's most loaded candidates, Capitol Hill's BP caucus, and much more.

All charts are based on federal election data compiled by the Center for Responsive Politics.

Corporate donations include money given by companies' employees and political action committees, unless noted otherwise. Counting employees as corporate donors isn't perfect: You may not give to a candidate with your employer's interests in mind. Yet excluding individual contributions would overlook "bundled" gifts from a company's employees as well as gifts from executives and their families.

Illustration: Steve Brodner

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