If you really want to try and defend Ron Paul on this I'm glad to take you down too. Plenty of Ron Paul people tried to defend him on this when they originally came out too.
This blog has a good synopsis of much of the controversy.
http://reason.com/blog/2008/01/11/old-news-rehashed-for-over-a-dp
In Ron Paul's attempt to disown the newsletters he first come straight out and says that he lied to everyone's face about the article's origin. That right off the bat is an interesting defense: "I was lying to you then, but I swear I'm not lying to you now".
Knock yourself out scrolling through the repeated defenses of the writings in those articles and then come back and tell me how they were all part of a mysterious conspiracy. Maybe he's sorry he made them now and maybe he's reformed his ways. If so, good for him! (now all he's got to do is learn something about economics)
None of this changes the fact that he was either a liar, a racist, or both.