Specialty Group Inc. of Knoxville, Tenn., has a peculiar specialty: political anonymity. The company filed for incorporation in late September. Within a few weeks, it had donated nearly $5.3 million to FreedomWorks for America, a conservative super PAC allied with former House majority leader Dick Armey. What is Specialty Group? Where does its money come from? From the public record, it’s impossible to tell. The Center for Public Integrity and the Center for Responsive Politics reported that the company’s registered agent is a Knoxville man, William S. Rose Jr.After news reports about the donation, Rose issued a statement describing Specialty as his investment firm, detailing his gripes with President Obama and assailing “prying media who seem hellbent on asking a private citizen about private facts.” He declined to answer questions about the source of the funds and described Specialty’s business as “my family secret.” And here is the most disturbing thing about the Specialty contributions: By the degraded standards of the 2012 campaign, they are a model of transparency.