President Obama and first lady Michelle Obama at 11 a.m. today will lead the country in a moment of silence to honor the victims of the shooting tragedy in Tucson, Ariz. Saturday that killed six people and injured 14, including Rep. Gabrielle Giffords. One of the victims fatally shot was a 9-year-old girl. The 22-year-old suspect will face a federal judge today at 4 p.m.