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3. Husband of Gabby Giffords announces run for Arizona Senate seat

Mark Kelly, a former Navy captain and retired astronaut, announced Tuesday in a video posted to Twitter that he will run in 2020 as a Democrat for the Arizona Senate seat that was held by John McCain until his death.

The big picture: Kelly is the husband of former congresswoman Gabrielle Giffords, who survived a 2011 shooting in Tucson. In 2013, the two founded a gun control advocacy organization. Said Kelly in his announcement video: "We’ve seen this retreat from science and data and facts and if we don’t take these issues seriously, we can't solve these problems."

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