title: Django request.user.username doesn't work
body: <p>Hi
  I've got a problem with the Django Template system. When I want to check in the template if a user is logged in with:</p>
  
  <pre><code>{% if user.is_authenticated %}
      # success
  {% else %}
      &lt;p&gt;Welcome, new user. Please log in.&lt;/p&gt;
  {% endif %}
  </code></pre>
  
  <p>I dont get to the success part. When I use in a view:</p>
  
  <pre><code>if not request.user.is_authenticated():
      return render_to_response('index.html', {'inhalt': 'Not loggged in'})
  else:
      return render_to_response('index.html', {'inhalt': 'Succesfully loged in'})
  </code></pre>
  
  <p>it shows me correctly the else part.
  Hope somebody can help me.
  Thanks Phil</p>