OpenSecrets.org
OpenSecrets.org is a site for tracking election contributions and spending. It provides figures for top contributors, contributions by industry, political actions committees (PAC), and donors, personal finances and travel expenses of the candidates and expenditures of the candidate's campaigns. This site tracks money given by geography, interest groups, and more. It also provides news stories about the candidates, legislation they have sponsored, and a breakdown of earmarks. It has a section devoted to Dark Money and the role that undisclosed campaign donations plays in our democracy.