I think that may be a consequence of how that poll has been set up (ie. restricted to that particular group). Normally you wouldn’t restrict a poll to trust level 0, as it would be the same as just leaving it open to anyone to vote on it. If you click on an option it should being up the /signup page if you’re not logged in. I’ll tidy up the example for the next refresh. 
This is a likely due to the nature of the refresh. We are looking at updating a few things over there very soon, so we may be able to smooth that out.