VoteSmart's mission is to provide free, factual, unbiased information on candidates and elected officials to ALL Americans.
Ballotpedia is a nonpartisan online political encyclopedia. Founded in 2007, it covers American federal, state, and local politics, elections, and public policy. Ballotpedia’s stated goal is “to inform people about politics by providing accurate and objective information about politics at all levels of government.” Is always well sourced.