Open Secrets lists candidates and their donors. There is a lot of ways to search the site because it is extensive! https://www.opensecrets.org/
League of Conservation Voters Scorecard looks at voting records on conservation-related legislation for national office holders by state. https://scorecard.lcv.org/
Ohio Environmental Council Scorecard posts environmental voting records of state-level elected officials and uses this and other information to make candidate endorsements. http://www.theoecactionfund.org/
Social Justice Committee, HUUC 