Obama visits Giffords, others at Arizona hospital

US first lady Michelle Obama stands with Congresswoman Gabrielle Gifford's husband, NASA shuttle commander Mark Kelly (C), and US Homeland Security Secretary Janet Napolitano (R) at the start of the event held to support and remember the victims of the mass shooting, at the University of Arizona in Tucson, Arizona, Jan 12, 2011. [Photo/Agencies]

People arrive for a memorial service for victims of the Jan 8 shooting at the University of Arizona in Tucson, Arizona Jan 12, 2011. [Photo/Agencies]