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Officials talk guns, hold buybacks after shootings

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The national gun debate swelled Tuesday as Arizona and the country commemorated the shooting rampage in Tucson, Ariz., two years ago that killed six people and left Rep. Gabrielle Giffords injured — an anniversary that came on the heels of the mass killing at a Connecticut elementary school. Here's how some state and local leaders are taking action: __ ARIZONA — Giffords and her...