Assuming a Clinton Presidency:
Arizona: Likely R (Safe if Flake can get through the primary)
California: Safe D (assuming Feinstein is a lifer and runs again; Likely without her)
Connecticut: Safe D (unfortunately, Murphy is a big HP)
Delaware: Safe D (in an open-seat and wave, I could see this within single digits, but it's still Safe)
Florida: Leans D (Tossup without Nelson; if Nelson loses reelection, it's
especially bad night for Ds)
Hawaii: Safe D (I suspect Hirono is a retirement possibility but it shouldn't matter)
Indiana: Leans R (assuming they can get a competent nominee in here -- Ballard is possible?)
Maine: Safe I (self-explanatory; depicted as D on map)
Maryland: Safe D (self-explanatory)
Massachusetts: Safe D (ditto)
Michigan: Likely D (Stabenow isn't
quite safe but it's hard to see her lose after the split between the Peters/Snyder races in 2014)
Minnesota: Safe D (Klobuchar is
quite safe and I doubt Hillary would waste her on a SCOTUS seat)
Mississippi: Safe R
Missouri: Likely R (Wagner is gonna
destroy McCaskill, or her appointed successor if she goes AGOTUS)
Montana: Tossup (depends on R nominee; MT bench is weak. Begich's defeat should give Tester pause, however)
Nebraska: Safe R
Nevada: Likely R (but there'll be
lots of hype here)
New Jersey: Likely D (Rs can't win here, but Menendez could conceivably lose)
New Mexico: Safe D (Udall won by 12 and this isn't getting any better for Rs)
New York: Safe D (haha)
North Dakota: Leans R (god, I hope it's not Cramer)
Ohio: Tossup (if Brown wins, it's a good night for Dems. In 2010/2014 environment, Mandel should be pretty comfortable winner)
Pennsylvania: Tossup (depending on nominee, very wide range of possibilities here)
Rhode Island: Safe D (obvi)
Tennessee: Safe R (...)
Texas: Safe R (doesn't mean this won't be
highly entertaining, of course)
Utah: Safe R (interesting to see how the primary goes here)
Vermont: Safe I/D (safe Bernie, but if he's done, Safe D)
Virginia: Tossup (depends on Nov 2017 election; if Rs win this goes to Likely R. Paging Barbara)
Washington: Safe D (Cantwell is surprisingly young and is going to be around for a while)
West Virginia: Tossup (considering Rahall got crushed but Justice is winning by double-digits, who the hell knows)
Wisconsin: Tossup (could see this as a Shaheen race that stays D even in a horrible night though; Baldwin has skills and I think Duffy is very overrated)
Wyoming: Safe R (lol)