Unfortunately, tautological reasoning doesn’t provide any insight.
On the larger question, I’ve looked for polling data on the Republican race that would break down support by demographics, but have had no such luck.
On the issue of why African-Americans may support Ron Paul, it is a valid question because it simply is a fact that Ron Paul has taken controversial stances on matters that are perceived as being importance to race issues in the United States. I am very reluctant to say he is a racist, I am more inclined to believe he lives in a fantasy world where the issue of race in America has been solved.
For example: Paul says he did not write the racist statements in the Ron Paul Report. I will take him at his word. However, that means he exercised no oversight of his newsletter for a period of years when the racist comments were made; and when they were discovered, it appears as though nothing happened. Paul cannot or will not identify who wrote those articles. I think it is a perfectly valid question to ask, why does Ron Paul have no idea which of his employees wrote racist screeds and published them in his name? What’s more, the leading suspect, Lew Rockwell, is still a very close associate to Ron Paul.
Secondly, Paul has repeatedly associated himself with organizations like the Ludwig Von Mises Institute, which takes curious positions along the lines of calling the Civil War necessary and periodically raking Abraham Lincoln over the coals. There seems to be some association and funding between that institute and various other causes that revolve around the Confederacy and intolerance, which probably would be a bit of a stretch to assign Paul any responsibility for, except in the context of…
Thirdly, there was an incident in the 2008 campaign in which it was discovered that the guy who runs the flagrantly racist website (which I shall not name, but has to do with inclement weather, if you get my drift) gave $500 to the Paul campaign. There was a furor (heh) over whether Paul would return the money, as I would think most mainstream candidates would do. Paul’s campaign rather proudly kept the money, in spite of some intense criticism.
Finally, we all know about his comments about how he believes it is wrong for the Federal government to legislate an end to segregation.
So, Paul seems to be completely out of the mainstream American views on issues of race, because he doesn’t seem to care who wrote racist articles in his name, he continues to associate with institutes that very much appear sympathetic to Confederate causes, gladly accepts contributions from at least one notorious neo-Nazi and racist, and states that the most important civil rights legislation since Reconstruction is basically unconstitutional. The question of why some African-Americans are unconcerned with this record of his is a matter of curiosity to me; as is the question of why ANYONE would overlook his very questionable record on what I think is one of the most important issues in American society.