The 4 Romney seats are toast in a Dem midterm
I think OH and WI would flip before MT and ND. But yeah, it'll almost certainly be Republicans if Clinton wins the presidency.
It'll almost certainly be Republicans either way. If Trump wins, the Senate will probably still be GOP-controlled. I don't see how Portman or Toomey lose if Trump carries their states. Same with Rubio in Florida. And then, in 2018, Dems are so maxed out that even in a wave, they could probably only add one seat (Nevada) while Claire McCaskill would probably still lose in Missouri.
The only way Republicans don't win it is if Clinton wins in an absolute rout and takes 10+ Senate seats with her. Then, 2018 is probably 2010 redux with Republicans taking a huge swath of House seats (and the majority if they've lost it) and a ton of Senate seats but still not enough to reclaim the majority.
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