One year ago Sunday a gunman opened fire while Congresswoman Gabrielle Giffords was holding a "Congress on Your Corner" event at a shopping center. She was shot in the head, one of 13 who were wounded. Six others were killed. Tucson is remembering the day with memorials, a candle-light vigil and dozens of other events. Host Rachel Martin talks with NPR's Ted Robbins about the day's services.