Story highlights Gabby Giffords, the former congresswoman is the focus of the latest ad backing Hillary Clinton's presidential campaign.

The ad, titled "Gabby," will run in Massachusetts through Tuesday

(CNN) Gabby Giffords, the former congresswoman who was gravely injured when she was shot in the head during an appearance near a Tucson supermarket in 2011, is the focus of the latest ad backing Hillary Clinton's presidential campaign.

The ad, titled "Gabby," will run in Massachusetts through Tuesday, when the state's Democrats will pick between Clinton and Vermont Sen. Bernie Sanders. The 30-second spot foscuses on Clinton's positions on stopping gun violence and tightening gun control laws.

"I am fed up," Giffords says in the ad. "We have a gun violence problem. So I am voting for Hillary Clinton. She is tough. She will stand up to the gun lobby. She will fight to make our families safer. It matters."

Clinton's voice then endorses the ad.

Giffords, then an Arizona Democratic congresswoman, was shot in the head ago during an appearance in front of a Tucson supermarket in 2011. She barely survived and stepped down from her House seat to recover. She and her husband, retired astronaut Mark Kelly, have become outspoken advocates for tighter gun laws. The couple have founded a political action committee, Americans for Responsible Solutions, to push their new project.

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