Former Arizona Congresswoman Gabrielle Giffords speaks at Co

Saturday marked the 25th anniversary of the mass shooting at Columbine High School in Colorado. A vigil was held Friday to remember the 13 victims who were murdered by two student gunmen.Former Arizona Congresswoman Gabrielle Giffords was among the speakers. She has been an outspoken advocate for tougher gun laws since being gravely wounded in a mass shooting near Tucson in

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