We actually, instead of building a campaign, use one of the analytics reports called email link performance. This shows for each email, all of the links in the email and then the number of total clicks and unique clicks. The one thing to remember is that if you use the same link twice, you'll need to add some coding to tell which is which. We generally just add "?text1" and "?text2" after the actual webpage in the link to differenetiate.