The American Version (Score 3, Interesting)

Something like this has been tried in America every election since 1992 by a non-profit organization called Project Vote Smart. They try to enlist the help of the local media to pressure candidates into filling out their issues questionnaire called the National Political Awareness Test (NPAT). Here is the version that candidates for the US Congress were asked to fill out in 2006.

The problem is that candidates don't feel the need to fill it out. They may get a little bit of bad publicity for not participating, but that's better for them than being pinned-down on where they stand on the issues. (See this article Politicians Grow Wary Of Survey as Internet Spreads Attack Ads on the topic from 10/25/26 issue of the Wall Street Journal).

Disclaimer: I used to work for Project Vote Smart about 10 years ago.