SOURCES: List of ethics cases from: "Catalog of Congressional Ethics Cases:
1796-1992," by Mary Ann Noyer, Brookings Institute, 1992. The study "lists
the names of all members of Congress who have faced ethics charges involving
official action…by the full chamber, an ethics committee or a court of law."
Cases cross-referenced with list of presidential general election
candidates, 1789-present, available at
http://www.infoplease.com/ipa/A0781450.html.