A few elections ago in the UK, a site like this got popular, where you'd answer a quiz and it would recommend the party most closely "matched" your preferences.

A few elections ago in the UK, a site like this got popular, where you'd answer a quiz and it would recommend the party most closely "matched" your preferences. A lot of people ended up getting recommended the green party, despite the fact the party is fairly fringe and has no real voting record. Turns out the site was set up by the Green party. Go figure.