Back in 2005, California governor Arnold Schwarzenegger signed a bill into California law that would make the selling of certain video games to minors a crime punishable by law and would require compulsory warnings for select games. The bill was passed, but a temporary injunction was issued to keep it from going into effect. In 2007, the law was found unconstitutional, but it didn't stop Schwarzenegger from trying again and just recently it was struck down yet again.
It is likely that the bill has been killed, but it seems Schwarzenegger and other law makers may try to appeal this decision in the Supreme Court. You can read up on it here