Allow anonymous users to vote

The "Drupal anonymous user" should be able to vote, multiple times, if that's the wish of the decision-planner. This would initially work as a public poll, but could eventually evolve into a system where a set of private keys is distributed and used to cast in ballots, to distinguish each anonymous users and keep people from voting twice. Each private key would be unique, would work only once, and an anonymous user wouldn't be able to vote without it.

This (the private key functionality) probably warrants a seperate feature request though, since it also applies to "real users".