How can you make that argument when they won 6 of the last 7 popular votes?
Not really, it's looking great for picking up a large number of gov seats, which is going to be the real prize in 2018.
You have 10 Senate seats up in now red states. Manchin will switch any day now.
What seats are you referring to?
Manchin's on the Senate Dem's team. Plus switching parties won't help Manchin if Trump fails to save coal. Besides, Jim Justice (D) won the gubernatorial race this year.
39 Governor seats are up and the large majority are Republican. If Trump isn't popular, it could get ugly. Also the Dems have a chance to recover the House.