http://election.princeton.edu/
http://votesmart.org
http://pollyvote.com/en/
http://www.270towin.com/
http://www.vox.com/
http://www.electoral-vote.com/
http://elections.huffingtonpost.com/pollster
http://machlis.com/elections/
http://opensecrets.org
http://cookpolitical.com/