How to allow commenting on Drafts…

This is how I did it….

add_action('comment_on_draft','pgm_commenting_on_draft');

function pgm_commenting_on_draft(){
	global $comment_post_ID;
	global $current_user;

	do_action('pre_comment_on_post', $comment_post_ID);

		$data = array(
		    'comment_post_ID' => $comment_post_ID,
		    'comment_author' => $current_user->user_login,
		    'comment_content' => $_POST['comment'],
		    'comment_date' => current_time('mysql'),
		    'comment_approved' => 1,
		);

		wp_insert_comment($data);
	wp_redirect($_SERVER['HTTP_REFERER']); //to avoid exit
}