This is equally valuable though, when looked at from the other direction. For each visitor on your website, you can see what the most recent referral campaign was that drove them to your site. With the tracking already set up, all we have to do is add that as a field to their visitor profile view.
Under the web profiling area, edit the profile view you want to show the most recent referrer campaign. Under profile fields, you should see an option for "most recent marketing campaign". Add that field to the appropriate spot in your profile view. You will also see similar fields for most recent search query, most recent channel, etc. All of these can be used in a similar manner, and can provide some very interesting insight into online media sources, blogs, and even Twitter.
With that in place, now when you use that Profile View for your reports, you will have columns that show the most recent online referral campaigns that drove each visitor to your site. Presenting this information in your visitor reports, especially those going out to your sales team can provide very important information as part of the prospect's digital body language.