This Washington Post article says that four Democratic members of Congress from California may not have followed Federal Election Commission rules that require safeguards for campaigns, to prevent embezzlement or other dishonest activity by campaign treasurers. Federal rules say large checks written on campaign accounts must be signed by two individuals, not one. Also the rules say the person who writes the checks is supposed to be someone other than the person who reads campaign bank statements. Thanks to Political Activity Law for the link.