Arizona - Janet Napolitano won't run, Ann Kirkpatrick (if she loses), Gabrielle Giffords or Mark Kelly (if they can/are interested)
Mississippi - Ronnie Musgrove, Travis Childers, Ronnie Shows, Mike Espy
Nebraska - Bob Kerrey or Brad Ashford
Nevada - Harry Reid won't run, Dina Titus
Tennessee - Jim Cooper, Phil Bredesen
Texas - Julian Castro, Joaquin Castro, Lloyd Doggett, or any of the big city mayors
Utah - Jim Matheson
Virginia - Terry McAuliffe
Wyoming - Dave Freudenthal
Of course, most of these won't run, and Utah, Miss., Texas, and Wyo. are unwinnable.
Arizona: I agree with the ones that you wrote, I would also add Kyrsten Sinema to that list. She is more likely to run than Napolitano or Kelly/Giffords, and she'd be a credible candidate.
Mississippi: Jim Hood would likely be Democrat's best candidate, he's proven he can win in deep red MI. He won't run though, and he'd still lose a Senate race.
Nebraska: Brad Ashford, but he'll probably run for reelection instead. Pete Festersen, an Omaha City Councilman who briefly ran for the seat Ashford now holds, could be a strong recruit as well.
Nevada: I agree with Dina Titus. Possibly Ross Miller, but he may run for Governor instead. Maybe Ruben Kihuen if he wins NV-04 in the fall (which I expect he will).
Tennessee: I agree with you, but neither will run (and neither could win).
Texas: Joaquin Castro. He's made some noise about running in 2018, he's the most likely candidate and would be formidable (even though he'd probably lose to Cruz in the general).
Utah: Jim Matheson or Doug Owens
Virginia: Completely disagree with you about VA. I don't think McAuliffe would be a great candidate, he's not particularly popular in VA in has some ethics questions as of late. I also think he'll probably get a job in the Clinton administration when he's done as Gov.. I think Mark Herring would be the best choice, with Bobby Scott and Don Beyer as other possibilities.
Wyoming: I agree, but he won't run.
