Form

<form action="<?php echo admin_url('admin-ajax.php') ?>" method="post">

	<?php
	$poll = current(get_posts('post_type=poll&posts_per_page=1'));
	$poll_options = (array) get_post_meta($poll->ID, 'poll_options', TRUE);
	?>

	<input type="hidden" name="poll_id" value="<?php echo $poll->ID ?>">
	<input type="hidden" name="action" value="poll_vote">
	<?php wp_nonce_field('poll_vote') ?>

	<?php
	foreach ($poll_options as $key => $value) {
		?>
		<div class="radio">
			<label for="poll-option-<?php echo $key ?>">
				<input type="radio" name="poll_vote" id="poll-option-<?php echo $key ?>" value="<?php echo $key ?>"> <?php echo $value ?>
			</label>
		</div>
		<?php
	}
	?>

	<button type="submit" class="btn btn-primary" id="poll-vote-button">Votar</button>

</form>