Respect to Ann Kirkpatrick for trying. Dems couldn't have found a better candidate. Certainly deserves more credit than Strickland or Murphy.
Sinema? Giffords? Carmona?
Sinema is an openly bisexual atheist. I'm not sure Arizona would like her(Though she would still probably be a good recruit). Giffords has recovered from the shooting in 2011, but she still has a strongly inhibited ability to speak(i.e. she can think fine, but has serious trouble communicating those thoughts), which would make voters unfairly question her mental ability. Carmona doesn't want to run anymore, so...