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A view of the large grassroots tribute memorial which grew up at Congresswoman Gabrielle Giffords' office after she and 18 other people were shot at her "Congress on Your Corner" event on January 8, 2011 in Tucson, Arizona. Six people lost their lives in the shooting that day. Photo by Barbara Loving.

A view of the grassroots tribute memorial which grew up at Congresswoman Gabrielle Giffords' office after she and 18 other people were shot at her "Congress on Your Corner" event on January 8, 2011 in Tucson, Arizona. Six people lost their lives in the shooting that day.

A view of the grassroots tribute memorial at Congresswoman Gabrielle Giffords' office which spontaneously grew after the shootings of Giffords and 18 others at her "Congress on Your Corner" event on January 8, 2011 in Tucson, Arizona. Six people perished in the attacks. Photo by Kevin C. Cox/ Getty Images.

People gather at the grassroots tribute memorial at Congresswoman Gabrielle Giffords' office in Tucson following the tragic shootings of January 8, 2011. Congresswoman Giffords and 18 others were shot at her "Congress on Your Corner" event at a Safeway store in Tucson, Arizona; six people perished in the attack.

Signs, candles, cards and flowers form the grassroots tribute memorial outside Congresswoman Gabrielle Giffords' office. The spontaneous memorial grew in response to the shooting of the congresswoman and 18 other who were participating in her "Congress on Your Corner" event on January 8, 2011 in Tucson, Arizona.

People viewing the spontanteous tribute memorial at Congresswoman Gabrielle Giffords' office in Tucson following the shootings of January 8, 2011. The congresswoman, along with 18 others, was shot and seriously wounded at a "Congress on Your Corner" event being held at a Safeway store in Tucson, Arizona. Six people perished in the attack. Photo by Kenne Turner.

A young girl writes a note to add to the spontaneous tribute memorial outside Congresswoman Gabrielle Giffords' office. The memorial grew in response to the shooting of Giffords and 18 others at her "Congress on Your Corner" constituent event on January 8, 2011 in Tucson, Arizona. Photo by Jack Kurtz/ZUMAPRESS.com.

A close-up view of some of the grassroots memorial items placed at Congresswoman Gabrielle Giffords' office in the wake of the shootings of January 8, 2011 in Tucson, Arizona. A gunman opened fire at Giffords' "Congress on Your Corner" event, killing six people and wounding 19 others, including Giffords. Photo by Barbara Loving.

Arizona rampage

People gathered to mourn and pay tribute at the spontaneous grassroots memorial which grew up outside Congresswoman Gabrielle Giffords' office following the shooting of Giffords and 18 others at her "Congress on Your Corner" event on January 8, 2011 in Tucson, Arizona. Giffords was gravely wounded and 6 other people perished in the shooting. Photo by Gina Ferazi

Tucson: People gather at the office of Rep. Gabrielle Giffords after Giffords was shot on January 8, 2011 at her "Congress on Your Corner" event in Tucson, Arizona. Nineteen people were shot; six people died in the attack.