TUCSON — The National Rifle Association has gone uncommonly dark since the weekend shootings here. A posting on its Web site expresses sympathies for the victims of the violence, and N.R.A. officials said they would have nothing to say until the funerals and memorial services were over. In Washington, bills were being drafted to step up background checks, create no-gun zones around members of Congress and ban the big-volume magazines that allowed the Tucson gunman... (GunPolicy.org)