query_posts() is messing up the main loop

I have posts which labeled category_name=news. I want to list all these post on the left sidebar by doing …

<ul>
  <?php query_posts('category_name=news'); ?>
  <?php if (have_posts()) : while (have_posts()) : the_post(); ?>
  <li>
    <a href="<?php the_permalink() ?>"><?php the_title() ?> &raquo;</a><br />
    <small><?php the_time('F jS, Y') ?></small>
  </li>
  <?php endwhile; endif; ?>
</ul>

However, as soon as I do this, it breaks the post listing of my whole site. It is almost as if the above query_posts function is interferring with the main loop in index.php.

As soon as I remove query_posts in the above, then my site works.

How I can just get a list of posts that are categorized as “news” and list them on the left sidebar?