“You and your colleagues … are concerned that requiring disclosure of this information would be a ‘a blatant attempt to intimidate, and potentially silence, certain speakers who are engaged in their constitutionally protected right to free speech,’” the Public Campaign Action Fund wrote in a letter to Issa. “What was not mentioned in this letter is that by opposing the executive order, you may be protecting the secrecy of one of your largest campaign contributors.”
“In addition,” wrote David Donnelly, the group's national campaigns director, “the letter raises an interesting question about whether you believe money influences policy decisions. If disclosing contributions could lead to retaliation in the procurement process, do you believe that campaign contributions to members of Congress--or lack thereof--could lead to undue influence or political payback?”
http://www.huffingtonpost.com/2011/05/10/darrell-issa-disclose-donors-obama_n_860013.html