I would love to see some social website experimentation with online voting, and caucusing/solicitation of voters' desires, correctly tracked to one per register

I would love to see some social website experimentation with online voting, and caucusing/solicitation of voters' desires, correctly tracked to one per registered voter. Might they not already exist? If we can make one robust enough and popular enough, maybe it can be the model (or the actual tool) used by our wonderful pols...