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President Barack Obama and first lady Michelle Obama (Credit: AP)

President Barack Obama and first lady Michelle Obama attend a memorial service in Tucson, Ariz., for the victims of a shooting rampage that that killed six people and left 14 injured. (Jan. 12, 2011)

Obama speaks at Ariz. shooting memorial

Summoning the soul of a nation, President Barack Obama implored Americans to honor those slain and injured in the Arizona shootings by becoming better people. (Jan. 13, 2011)

President Barack Obama and first lady Michelle Obama
(Credit: AP)

President Barack Obama and first lady Michelle Obama attend a memorial service in Tucson, Ariz., for the victims of a shooting rampage that that killed six people and left 14 injured. (Jan. 12, 2011)

President Barack Obama speaks during the memorial event,
(Credit: Getty Images)

President Barack Obama speaks during the memorial event, Together We Thrive: Tucson and America" at the McKale Memorial Center in Tucson, Arizona, on Jan. 12, 2011. Obama led a tribute service for the six people who were killed and the 14 wounded in the assassination attempt on congresswoman Gabrielle Giffords.

President Barack Obama speaks during the memorial event,
(Credit: Getty Images)

President Barack Obama speaks during the memorial event, Together We Thrive: Tucson and America" at the McKale Memorial Center in Tucson, Arizona, on January 12, 2011.

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President Barack Obama tears up during his speech
(Credit: Getty Images)

President Barack Obama tears up during his speech at the event "Together We Thrive: Tucson and America," at the University of Arizona. (Jan. 12, 2011)

President Barack Obama pauses during his address the
(Credit: MCT/Will Seberger)

President Barack Obama pauses during his address the crowd at the "Together We Thrive" program at the University of Arizona, honoring the victims of the Tucson, Arizona, shooting rampage that claimed the lives of six people and wounded more than a dozen others, including Rep. Gabrielle Giffords. (Will Seberger/MCT)

First Lady Michelle Obama and NASA astronaut Mark
(Credit: Getty Images)

First Lady Michelle Obama and NASA astronaut Mark Kelly, husband of US congresswoman Gabrielle Giffords, listen as President Barack Obama speaks during a memorial event in Tucson, Arizona, on Jan. 12, 2011.

A sign reading
(Credit: Getty Images)

A sign reading "We will heal" is displayed during a memorial in Arizona for the six people killed during an assasination attempt on Rep. Gabrielle Giffords. (Jan. 12, 2011)

President Barack Obama speaks during a memorial event
(Credit: Getty Images)

President Barack Obama speaks during a memorial event for the six people who were killed and the 14 wounded in the assassination attempt Rep. Gabrielle Giffords. (Jan. 12, 2011)

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President Barack Obama speaks during the memorial event,
(Credit: Getty Images)

President Barack Obama speaks during the memorial event, Together We Thrive: Tucson and America" at the McKale Memorial Center in Tucson, Arizona, on Jan. 12, 2011.

President Barack Obama hugs NASA astronaut Mark Kelly,
(Credit: Getty Images)

President Barack Obama hugs NASA astronaut Mark Kelly, husband of U.S. Rep. Gabrielle Giffords. (Jan. 12, 2011)

President Barack Obama and First Lady Michelle Obama

President Barack Obama and First Lady Michelle Obama attend a memorial event, Together We Thrive: Tucson and America", at the McKale Memorial Center in Tucson, Arizona. (Jan. 12, 2011)

President Barack Obama joins the audience in applauding
(Credit: AP Photo/J. Scott Applewhite)

President Barack Obama joins the audience in applauding Daniel Hernandez, an intern for Rep. Gabrielle Giffords who helped her after she was shot, during a memorial service in Tucson, Ariz., Wednesday, Jan. 12, 2011, for the victims of a shooting rampage that that killed six people and left 14 injured. (AP Photo/J. Scott Applewhite)

President Barack Obama greets Daniel Hernandez Jr., an
(Credit: Getty Images)

President Barack Obama greets Daniel Hernandez Jr., an intern of Rep. Gabrielle Gifford's who helped save her life during the shooting rampage. (Jan. 12, 2011)

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President Barack Obama and first lady Michelle Obama
(Credit: Getty Images)

President Barack Obama and first lady Michelle Obama attend a memorial for the Arizona shooting spree victims in Tucson, Arizona. (Jan. 12, 2011)

President Barack Obama attends a memorial event, Together
(Credit: Getty Images)

President Barack Obama attends a memorial event, Together We Thrive: Tucson and America", at the McKale Memorial Center in Tucson, Arizona. (Jan. 12, 2011)

Daniel Hernandez, Jr., an intern for U.S. Rep.
(Credit: Getty Images)

Daniel Hernandez, Jr., an intern for U.S. Rep. Gabrielle Giffords', helped save Giffords life immediately after she was shot in the head on Jan. 8, 2011. (Jan. 12, 2011)

Thousands wait in line to enter McKale Memorial
(Credit: AP Photo/Deirdre Hamill)

Thousands wait in line to enter McKale Memorial Center in Tucson, Ariz. where President Barack Obama will attend a memorial event for the six people who were killed last Saturday on Wednesday, Jan. 12, 2011. Obama and his wife, Michelle, are visiting privately at University Medical Center with Giffords and other victims of the weekend shootings. (AP Photo/The Arizona Republic, Deirdre Hamill)

Thousands wait in line to enter McKale Memorial
(Credit: AP Photo/Deirdre Hamill)

Thousands wait in line to enter McKale Memorial Center in Tucson, Ariz. where President Barack Obama will attend a memorial event for the six people who were killed last Saturday on Wednesday, Jan. 12, 2011. Obama and his wife, Michelle, are visiting privately at University Medical Center with Giffords and other victims of the weekend shootings. (AP Photo/The Arizona Republic, Deirdre Hamill)

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President Barack Obama and first lady Michelle Obama
(Credit: AP Photo/Chris Morrison)

President Barack Obama and first lady Michelle Obama walk on the tarmac of Davis-Monthan Air Force Base in Tucson, Ariz. Wednesday, Jan. 12, 2011. The Obamas are in Tucson to pay tribute to the six people killed in the weekend shootings and to the fighting spirit of wounded lawmaker Gabrielle Giffords, the target of the first assassination attempt on a member of Congress in decades. (AP Photo/Chris Morrison)

President Barack Obama and first lady Michelle Obama

President Barack Obama and first lady Michelle Obama disembark in Tucson, Arizona, to attend a memorial event for the victims of a mass shooting in Tucson. (Jan. 12, 2011)

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