By The Associated Press

More than a dozen survivors and family members from the Jan. 8, 2011 shootings in Tucson have outlined for Attorney General Eric Holder their campaign to stem gun violence.

The attorney general agreed to present President Barack Obama with more than half a million signatures the survivors and family members helped gather, they said.

The shooting left six dead and 13 wounded, including then-Congresswoman Gabrielle Giffords, who eventually resigned her House seat to focus on her recovery.

Giffords' successor in Congress, Ron Barber, also was wounded. At the time, he was her district office director.