The controversy surrounding decades-old newsletters to which GOP presidential aspirant Ron Paul lent his name is regrettable. First, it is regrettable because the sometimes bigoted, intolerant content of those newsletters is inconsistent with the views of the congressman as understood by those of us who know him. Yet, while Mr. Paul disavows supporting those ideas, he refuses to repudiate his close association with their likely source, Lew Rockwell, head of the Alabama-based Mises Institute.

Second,...