The RNC request to not use their logos did not impose on anyone's free speech. In addition, the use of the logo implies an endorsement by the copyright holder.
Can you prove that? By the way, in case that was a weaselly turn of phrase there, we're talking about freedom of the press, not just freedom of speech. Should we be restrained from printing pro-GOP parody art while the DUmmies can print whatever obscene propaganda they please?