What an interesting question.
It kind of acknowledges that Paul's presidential campaign was never about actually winning the presidency, in which case, and considering the fact that he ended up three slots behind last place, then you'd have to agree...his presidential campaign was a success, insofar as he didn't win.
The scary thing about Paul is that you listen to him, and you begin to realize that he makes sense on several levels, which makes you take a serious look at the guy, and the you just say "that guy is just ing weird looking! He looks crazy! I can't vote for him!"