UPDATE: Arizona congresswoman shot, at least six killed

Saturday, January 8, 2011 | 3:12 p.m. CST; updated 1:56 p.m. CST, Sunday, January 9, 2011

TUCSON, Ariz. — Rep. Gabrielle Giffords of Arizona was shot in the head Saturday by a gunman who opened fire outside a grocery store during a meeting with voters, killing a federal judge and five others in a rampage that rattled the country and left Americans questioning whether divisive politics had pushed the suspect over the edge.