Oct 12 2012: This is a very good idea and I wish more politicians would adopt this model however I think the system is simply incompatible for this kind of action. People who are dedicated enough to create and maintain community-changing projects such as the ones you suggest usually do so because they simply have a yearning to help people. I personally don't believe that any politician who is "political" enough to be considered for a major election is doing so because they want to directly help people.
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A comment on Conversation: How to run a winning campaign... in any democracy.