This site tracks the candidates statements and actions. You fill in a questionnaire and it shows you which candidates match your interests. They says they update this as the candidates shift around. Connect2Elect.com
This site collates publicly available data on campaign contributions and votes. They track California and the US Congress. Does AT&T get their money’s worth? MapLight.org
This site tracks the presidential campaign contributions. Their tag line is, “Your Guide to the Money in US Elections”. OpenSecrets.org