There are many voices speaking out about the Autism/Vaccine connection besides Jenny McCarthy.
It seems the CDC has tried to coverup/dismiss the connection.
http://healthchoice.org/index.php/news/122-outline-of-significant-developments-in-the-recent-revelations-on-vaccine-safety-research-corruption
Quoting from the link above
8/18/14 – A video is released on the Internet with audio purported, and later confirmed to be, discussions between Dr. Brian Hooker and CDC senior research scientist Dr. William Thompson, one of the original MMR paper’s authors. The video claims that Thompson told Hooker in phone conversations that the research team found the association between vaccines and autism, and then changed the parameters of the study to get rid of the association, so they would not have to report it to the public. In the audio Thompson expresses great shame and remorse for “lying” and for going along with what the “higher-ups wanted.”