Former Rep. Gabrielle Giffords and her husband, astronaut Mark Kelly, launched a new campaign Tuesday that they said would push for stricter gun laws and counter the political influence of the National Rifle Association.

On the second anniversary of the attempted assassination of Giffords in a mass shooting in Tucson, Ariz., the recovering former congresswoman is adding her political cache to the emotionally fraught debate over the nation’s gun violence.

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