For the Brady Foundation, McCann New York introduces a new way to make your voice count -- by using it to sign a petition against violence. Billed as the first-ever "audio petition," the site lets you "sign" your name orally. You can view the petition and hear who has signed it, add your own voice, download an app to recruit others, and even get the site to call Congress for you. The petition hopes to pressure members of the government to support legislation extending Brady background checks to gun sales. Plenty of famous people have added their voices -- Tony Bennett was one of the first signers.