Restrict users that can vote in a certain poll

Hi,

I guess one way of restricting users that can vote in a certain poll is to have a page that only a certain group of users can see and then to embed the poll in that page. This is Joomla 1.7.0 and Community Polls 1.6.4.

Is there a smarter way of achieving this that I've missed? :)

Many thanks,

Dave.