Via 538 (my understanding is that the odds are pretty good that McSally gets in):
Other potential Republican candidates whose names had been buzzed about — Robert Graham and Jeff DeWit — are on good terms with Trump and are more conventional politicians than Ward. DeWit is the state treasurer, and Graham ran the Arizona Republican Party and got favorable reviews for his efforts to unite the emergent tea party forces with more establishment Republicans. Neither man is a polarizing figure in the state the way Ward is, and as Graham told FiveThirtyEight in September, GOP donors in Arizona have been clamoring for either of them to enter the race and unite establishment Republicans and far-right activists behind a single candidate. Dustin Stockton, Ward’s former campaign manager, told FiveThirtyEight that Rep. Martha McSally is also being talked about as a potential entrant to the race. DeWit seemed to acknowledge the pressure to join the race in aTuesday-afternoon tweet posted after Flake’s announcement.