1 of 9 — President Obama hugs NASA astronaut Mark Kelly, husband of U.S. Rep. Gabrielle Giffords, who remains hospitalized after being shot Saturday.
President Obama hugs NASA astronaut Mark Kelly, husband of U.S. Rep. Gabrielle Giffords, who remains hospitalized after being shot Saturday.
2 of 9 — Thousands crowd into the McKale Memorial Center for the event, dubbed "Together We Thrive: Tucson and America."
Thousands crowd into the McKale Memorial Center for the event, dubbed "Together We Thrive: Tucson and America."
3 of 9 — A group mourns during the service.
A group mourns during the service.
4 of 9 — A woman is comforted at the University of Arizona's McKale Center.
A woman is comforted at the University of Arizona's McKale Center.
5 of 9 — President Obama greets family members of shooting victims during the memorial event.
President Obama greets family members of shooting victims during the memorial event.
6 of 9 — President Obama speaks to a crowd of 14,300 in the McKale Memorial Center, while another 13,000 watch on big screens in the nearby football stadium.
President Obama speaks to a crowd of 14,300 in the McKale Memorial Center, while another 13,000 watch on big screens in the nearby football stadium.
7 of 9 — President Obama said it was important for Americans to pause to make sure "we are talking with each other in a way that heals, not in a way that wounds."
President Obama said it was important for Americans to pause to make sure "we are talking with each other in a way that heals, not in a way that wounds."
8 of 9 — The Obamas stand next to Giffords' intern, Daniel Hernandez, who was honored as a hero at the event. Arizona Gov. Jan Brewer said Hernandez's quick actions probably saved Giffords' life. Hernandez rushed to help the congresswoman after she was shot.
The Obamas stand next to Giffords' intern, Daniel Hernandez, who was honored as a hero at the event. Arizona Gov. Jan Brewer said Hernandez's quick actions probably saved Giffords' life. Hernandez rushed to help the congresswoman after she was shot.
9 of 9 — People wait in line for the memorial service at the University of Arizona campus in Tucson.
People wait in line for the memorial service at the University of Arizona campus in Tucson.