Retired astronaut Mark Kelly kicks off Arizona Senate bid

TUCSON, Ariz. (AP) — Retired astronaut Mark Kelly kicked off a "mission for Arizona" Saturday as he launched his U.S. Senate campaign with a rally in Tucson, the city where his wife, Gabrielle Giffords, survived a shooting when she was a congresswoman. That attack in 2011 led Kelly to leave NASA and become a political activist, pushing for gun control.

Kelly, who has never held elected office, is the first Democrat to enter the 2020 race. The seat is now held by Republican Martha McSally, a former congresswoman and Air Force pilot who was appointed by Arizona's GOP governor after longtime GOP Sen. John McCain died.

Next year's election will decide who finishes the final two years of McCain's term.