Former Rep. Gabrielle Giffords and Democratic congressional candidate Ron Barber celebrate Mr. Barber's victory in a special election on Tuesday, June 12, 2012, in Tucson, Ariz., to fill the vacant House seat that Mrs. Giffords held. (AP Photo/Ross D. Franklin, Pool)

Photo by: Ross D. Franklin

Former Rep. Gabrielle Giffords and Democratic congressional candidate Ron Barber celebrate Mr. Barber's victory in a special election on Tuesday, June 12, 2012, in Tucson, Ariz., to fill the vacant House seat that Mrs. Giffords held. (AP Photo/Ross D. Franklin, Pool)