Poll creation and Captcha - (Sorted)

I'm using the standard Polls Module and Captcha Module. Can anyone tell me how I can get a Captcha on a new poll creation form.

I know how to set up a Captcha that has to be completed before someone can actually vote on an already existing poll, and I know how to set up a Captcha that has to be completed before someone can comment on an existing poll.

What I want to do is force the completion of a Captcha when a new poll is actually being created.

I want to allow visitors to create a new Poll, but can't find a way of making visitors complete a Captcha to allow them to create a new poll.

On the Captcha admin page I've added 'Poll' as a form_id but it doesn't appear on a poll at the time of creation. It only appears as an option when someone actually votes after the poll has been created.

SORTED.

If anyone else is interested. The Poll form_id wasn't poll. It was poll_node_form

Once I'd added the form_id of poll_node_form to the Captcha admin page everything worked OK