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The pollfield_voting_form returns a rendered form for use on the node pages (and some others in think). However the form isn't processed as drupal forms should be so it has no proper form_id and also doesn't allow for hook_form_alter's to be run on it. Basically I think you just need to run drupal_prepare_form on the form so that it acts as it should. I've attached a patch that fixes this issue.