title: Partial italics, axis.text.x
body: <p>Aloha,</p>
  
  <p>For the following bar graph:</p>
  
  <pre><code>x &lt;- ggplot(foo, aes(x=variety, y=percent)) + geom_bar()
  </code></pre>
  
  <p>The following italicizes all of my x-axis text:</p>
  
  <pre><code>x + opts(axis.text.x=theme_text(face='italic'))
  </code></pre>
  
  <p>However, I would like to italicize only the species names, not the control.  </p>
  
  <pre><code>levels(foo$variety)
  "control"    "species1" "species2"     "species3" 
  </code></pre>
  
  <p>Any suggestions?</p>