retired astronaut mark kelly just announced that he is running for john mccain's senate seat in arizona. >> i did not like the trajectory of our country. i didn't like where we were going. and, you know, you can sit around and complain about it or you can try to do something about it. gabby was a public servant. i learned a lot from her about how to enact policies to improve people's lives. on so many different issues we care about. >> global warming. >> we care about global warming. >> health care. >> health care. >> gabby was in the hospital for six months. >> yes. >> and without excellent health care. >> yes. >> in gabby's case provided by the united states government as a member of congress, i don't know what we would have done. >> yes, yes. >> gabby, what's a campaign like? >> so exciting. >> a lot of this stuff especially campaigning comes much easier to her.