This should not be about poll results but about the legality of the government stepping in and regulating the sale of this material. Video games should be treated the same way as movies. There is a self regulating body for both movies and games, the MPAA for movies, and the ESRB for video games. In both cases, ratings are applied to video games, and then the store decides what policies it wants to enact when selling them, and finally the choice of the customer whether or not to purchase the game or movie. Most stores that I have been to require an ID check for anyone appearing to be under the age of 18.
If it's a crime to sell video games with certain ratings to certain age groups, then it follows that the next step is to restrict the purchase of videos. After that the government will need to enact their own rating boards. And the final step is government censorship.