Referer for campaigns

I just started using the campaign feature to track visits coming from banners on other sites that link to pages on my site.
I can see the campaign name in Referers - Campaigns and I expected to see info about the referers. But that information seems to be lost.
It is not in Campaigns and it is not in Web sites.
I can see the referer only in the real time visits box.
Is it possible to get referers for campaign visits?
Or am I using the wrong piwik tool?

Thank you