How can the 'everyone' role be permitted to vote in an embedded poll?

I have a poll embedded in a piece of content, could be a blog, article, wiki, forum post.

I want that poll, and only that poll, maybe even only that poll in one application, to be vote-able on by the 'everyone' roll to get the most numbers of people voting in that poll from the public.

Having to be a member is too much of a barrier to simply get someone to vote in a poll.

How can I do that?