Ron Paul long ago disqualified himself for the presidency by peddling claptrap proposals like abolishing the Federal Reserve, returning to the gold standard, cutting a third of the federal budget and all foreign aid and opposing the Civil Rights Act of 1964.

Now, making things worse, he has failed to convincingly repudiate racist remarks that were published under his name for years — or the enthusiastic support he is getting from racist groups.

Mr. Paul, a Republican congressman from Texas who is doing particularly well in Iowa’s precaucus polls, published several newsletters in the ’80s and ’90s with names like the Ron Paul Survival Report and the Ron Paul Political Report. The newsletters interspersed libertarian political and investment commentary with racial bigotry, anti-Semitism and far-right paranoia.

Among other offensive statements, the newsletters said that 95 percent of Washington’s black males were criminals, and they described the Rev. Dr. Martin Luther King Jr.’s birthday as “Hate Whitey Day.” One 1993 article appeared under a headline lamenting the country’s “disappearing white majority.” Other articles suggested that the Mossad, the Israeli intelligence service, was responsible for the 1993 World Trade Center bombing, praised the Louisiana racist David Duke and accused some gay men with AIDS of deliberately spreading the disease, “perhaps out of a pathological hatred.”