Before you bring up “credibility issues”, you should make sure the comment you’re posting does not damage your credibility.
By claiming Paul subscribes the “rand/hayek/friedman school of political economy”, you reveal that not only are you not familiar with Paul’s views but that you’re also not familiar with the views of Rand or Friedman.
Friedman was a member of the Chicago School (aka “monetarism” which shares its roots with Keynesianism) while Hayek and Paul are members of the Austrian School. If you’re truly interested in the major and irreconcilable differences between the Austrian School and the Chicago School, see Milton Friedman Unraveled, written by Paul’s mentor, Murray Rothbard (also a Jewish anarchist).
Adding Rand’s cult of Objectivism into that weird conflation of incompatible philosophies makes even less sense.
If you want to point out the areas where Paul is wrong, there is plenty to point out (not as much as there is to point out with Rand and Friedman but still plenty). I have actually written quite a bit on the subject. But, if you’re going to criticize, make sure you understand what you’re criticizing. Otherwise, it could lead to “credibility issues”. And while I certainly won’t be voting for Paul (or anyone for that matter), there is no doubt that he is the only person on the left of the political spectrum running for president (including Obama).