right here in newtown, connecticut, the site today of a mass shooting and this time gunfire aimed at elementary school children. even for a nation that is sadly becoming more and more desensitized to mass shootings, the newtown massacre was sickening, prompting taking its place as one of the worst mass shootings in u.s. history. but it wasn't an isolated incident. >> they were shooting people and throwing grenades and stuff. >> seven are dead, at least in this shooting. >> when a gunman opened fire and killed five people before taking his own life. >> among those shooting victims is congresswoman gabrielle gifford. >> i got people running out of