I think you can rule out political differences as a motive.
The DOA at the medical center was a nine-month-old infant.
U.S. Marshal for Arizona David Gonzales confirmed to the
Associated Press that U.S. District Judge John Roll died in the attack Saturday.
At least 19 people were shot at Giffords' "Your Corner" event held outside a Safeway grocery store in Tucson, including three members of the Democratic congresswoman's staff in Arizona. Five have died, including one of Giffords' aides, and nine are in critical condition at the University of Arizona Medical Center.
Fox News confirmed that a 22 year-old white male named Jared Loughner was taken into custody as the alleged shooter.