VoteSmart.org - Learn more about candidates' voting records, see campaign contributions, read speeches, and find out their stance on major issues. Covers officials from the local level to the executive branch.

Guide to Issues & Debates - Links to organizations and groups associated with major issues, such as abortion, education, immigration, etc., and presents links from both sides of an issue.

California's Special Interest Groups - A guide to politically significant special interest groups in California organized by industry.

Campaign Financing - Explanation of finance laws and regulations, and guides to current finance data upcoming elections from the Federal Election Commission.  Also take a look at opensecrets.org

California's Guide to Campaign Finance & Lobbyists - California's official database designed to monitor campaign financing and lobbying activities.