The hardest part of an open source poll would be anonymization. Demographic information in some areas could be enough to come pretty close to uniquely identifyi

The hardest part of an open source poll would be anonymization. Demographic information in some areas could be enough to come pretty close to uniquely identifying an individual. The rest of it: Likely Voter Models, Demographic Weighting, etc would be pretty easy to have open source and reproducible once you've solved the issues.