Ballot Wiki: A wiki providing information on candidates and ballot measures in all the states.
Nate Silver’s Polling Blog: Nate Silver’s blog, now hosted by the New York Times, covering electoral polling and politics at the national and state levels.
CQ Roll Call – Finance: CQ Roll Call’s Political MoneyLine Web site, which provides information on campaign finance, lobbying and lobbyists, and parties and candidates.
Open Secrets: Web site of the Center for Responsive Politics, a nonpartisan organization tracking money in politics.
Center for Public Integrity: Web site of the Center for Public Integrity, which produces, among other investigative journalism reports, pieces on campaign finance and lobbying activity in the states and Washington, D.C.