"Retired astronaut Mark Kelly is taking steps toward a bid against" Sen. Martha McSally (R-AZ) "in 2020, identifying potential staffers and strategists and meeting with Democrats around Arizona—though his allies say no final decision has been made. Democratic sources said Kelly ... has been calling and meeting with top Democratic activists in Arizona since late last year. He has identified a campaign manager, according to two of those sources, and he is working with one of Arizona’s top Democratic strategists as he considers his future."
Democratic strategist and Kelly spokesman Rodd McLeod: "Mark appreciates the encouragement that he’s gotten from folks who are looking for someone to represent us in Washington who will address serious problems like low wage growth, climate change, health care. He’s going to make a decision, but he has to go through a process of making sure that he considers what running for Senate would be like for him and his family."
Other contenders who've voiced serious interest in former Sen. John McCain's (R) seat include Rep. Ruben Gallego (D-07) and former State Attorney General Grant Woods (D), both of whom have met with Senate Minority Leader Chuck Schumer and the DSCC, as has Kelly.
Sen. Kyrsten Sinema (D) "has been introducing Woods around Washington as he considers his own bid for the Senate seat. ... Several sources said Gallego has begun interviewing possible staffers and consultants. He is likely to make a final decision in the coming weeks, though those sources said he is unlikely to announce before March 12, when Phoenix holds a runoff to elect the city’s next mayor." Gallego's ex-wife is that race's front-runner. (The Hill)