Mark Kelly is running for US Senate in Arizona

https://www.vox.com/policy-and-politics/2019/2/12/18221888/mark-kelly-astronaut-arizona-senate-gabby-giffords

Mark Kelly, husband of former Congresswoman Gabby Giffords, announced today that he is running for US Senate in Arizona. The seat up for reelection in 2020 is currently held by Martha McSally. Kelly's campaign announcement video focuses on his experience as a Navy captain, astronaut, and most importantly husband, as he continues to support his wife after she was shot in the head.

Could he win in the historically Republican state of Arizona?
Kyrsten Sinema's successful election in 2018 seemed to signal Arizona's movement towards the Democratic party. Additionally, Arizona Senators do not have a history of meshing well with Trump, as John McCain and Jeff Flake remained outspoken critics throughout their time in Congress. If Arizona continues to move away from the party of Trump, a high-profile Democratic figure like Kelly may have a good chance at winning the seat, though he also must make it through the primary.

Background on this Senate Seat:
August 2018: Senator John McCain passes away from brain cancer
September 2018: Arizona Governor Doug Ducey appoints former Senator John Kyl (who served Arizona from 1995-2013 and served as Minority Whip from 2007-2013) to fill the vacancy
December 2018: John Kyl resigns, Gov. Ducey appoints Martha McSally to fill the vacancy, one month after her loss to Kyrsten Sinema for the other Arizona Senate seat

(5C Connection: Gabby Giffords graduated from Scripps in 1993)