I don't know of a specific website, but I can offer a suggestion that might help. For the elections in which you are qualified to vote, find out who the candidates are, and simply research them. That's as complicated as it gets for me. I think it would be nice to be able to just plug a name into an online database, and find out all the political candidate's stand on every conceivable issue, but how could you trust such a site to not be slanted in one direction or another? You have half the battle won already in that you know how you stand. All that's left is to learn about the candidates.
The peculiar evil of silencing the expression of an opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it. If the opinion is right, they are deprived of the opportunity of exchanging error for truth: if wrong, they lose, what is almost as great a benefit, the clearer perception and livelier impression of truth, produced by its collision with error. ~John Stuart Mill, On Liberty, 1859
Education: that which reveals to the wise, and conceals from the stupid, the vast limits of their knowledge.