I have it set so that guests and registered users can vote (and view results).
When logged in, all works fine.
When logged out, the View Results text link appears on the left, directly beneath the Vote Button and the link doesn't work. You cannot vote also. It is like it doesn't allow you to vote/view results as a guest.... but the guest user is left thinking there is an error because there is no message to say that 'You must be registered user to engage in our poll'. In any case, I have it set for both guests and registered users.