Well, one person-one vote would require a login to ensure that only one person would get one vote. Otherwise there are too many factors such as different browsers, IP addresses, devices, etc that one person can use multiple times and can be potentially used by multiple people. Now if everyone had a fingerprint scanner then it could be as simple as a scan of the finger and done.
However, I think this poll is more about how large of a fan base do you really have that is dedicated.