He isn't because he often raises issues which aren't "on the agenda". So he'll make statements for instance about returning to the gold standard, or getting rid of all overseas military bases. These are not only radical suggestions, but they're also not things being discussed in the "national debate". So he comes off as not only radical, but out of touch with what people find important.

There is generally a feeling that Congress should be addressing issues that the people are concerned about. How, do you determine what concerns the people? You look through the insane prism of the media.

PS: Full disclosure, I supported Ron Paul in both his runs for president.