I'm trying to see how the text in my Google AdWords ads affects my metrics in Analytics. I have auto-linking enabled, so I figured I would be able to automatically see this in Analytics. Unfortunately, if I try to add a second dimension of Traffic Sources->Ad Content, the metrics are only split by the ad's Headline. Most of my tests are changing only the ads' descriptions...

So I guess I need to add a tracking parameter like ?campaign=special_text to my URLs? Or is there a way to see the ads split by ad descriptions? Should I add the full suite of utm_campaign/utm_medium/etc parameters? What's the proper way to track these ads which are mostly similar except the ad descriptions?