The League of Women Voters is one of the best sources of information about a candidate. It is a nonpartisan group that submits a series of issues questions to candidates along the length of the ticket and allows them to provide a concise response. The questions take pains for objectivity, and the conciseness often cages politicians into a more precise answer than they will give the press or on the stump. If the candidate (especially a local candidate) does not answer or cannot follow the rules to avoid their answer from being cut-off mid-sentence, well, that also speaks volumes.
Quite simply, these are the best answers you’ll get to issue-oriented questions from a candidates own questions.
Some tickets are available for Pennsylvania and Florida, as well as the Presidential race here. More localized information is available through Local Leagues.
I usually cross-examine this information against newspaper endorsements and background information I have on candidates; this process enables me to deliberately vote at times for Republicans and third parties, whereas otherwise I would vote more strictly along Democratic party lines.