Poll is Active after closing date reached

Looks like flag "active" changes only at cron run by function decisions_cron().
Can we call function decisions_cron() one more time before "Cancel your vote" do the damage?
I was thinking about putting it just before anything else:

function decisions_cancel_form($form_state, $nid) {
decisions_cron();
$form['node'] = array('#type' => 'hidden', '#value' => $nid);
$form['submit'] = array('#type' => 'submit', '#value' => t('Cancel your vote'));
return $form;
}

I don't suppose this is most elegant way but since I'm noob and solution is working... What do you say guys?

BTW: That JOIN in decisions_cron() - is it really necessary?

Patch attached. Please review.