I think this really is an idea whose time has come. The survey is onscreen, in the voting booth. Voters do the survey for as long as they want, including not at all. At any point in the survey, the voter selects "cast your vote", then several "are you sure"-type prompts follow to ensure that the voter understands (kind of a stretch for some, I know) that s/he is actually voting and not just taking the survey.

It's not a departure from political ads, i.e., people who are good at the survey process bubble up and try to focus the survey towards their candidate winning. And some people would likely do the survey and then switch their votes because they get offended, as it is almost exclusively now with political ads.

Regardless of the implementation, what I love about this idea is that people love to take surveys. I like to think that this approach would have people love to vote, and that it would dramatically increase the size of the informed electorate.