[Washington DC, January 10. Image via Getty.]
WASHINGTON, DC – JANUARY 10: U.S. President Barack Obama and first lady Michele Obama depart after observing a moment of silence to honor those killed and wounded during a shooting in Tucson, Arizona on January 10, 2011 in Washington, DC. President Barack Obama called on the nation to observe a moment of silence today at 11:00am in honor of the six people killed and at least 13 others wounded including U.S. Rep. Gabrielle Giffords (D-AZ) when a gunman opened fire at a public event held at Tucson Safeway supermarket. (Photo by Mark Wilson/Getty Images)
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