Reacting to the assassination attempt on one of their own, two House members on Monday said they will introduce legislation that would ban certain ammunition clips and make it illegal to threaten a federal official, both of which they say contributed to the mass casualties in a shooting rampage in Tuscson over the weekend. Rep. Carolyn McCarthy, D-N.Y., plans to introduce a bill that would ban high-capacity ammunition clips like the one used by Jared Loughner, the gunman accused of killing 6 and injuring 14, including Rep. Gabrielle Giffords, D-Ariz., as they gathered at a “Congress on Your Corner” event....