PHOENIX — Former U.S. Rep. Gabrielle Giffords and her husband launched a political action committee aimed at curbing gun violence on Tuesday, the second anniversary of the Tucson shooting that killed six people and left her critically injured.

Giffords and Mark Kelly wrote in an op-ed published in USA Today that their Americans for Responsible Solutions initiative would help raise money to support greater gun control efforts.

"Achieving reforms to reduce gun violence and prevent mass shootings will mean matching gun lobbyists in their reach and resources," they wrote in the column.