House: D+25-35, narrow D majority
Senate: R+1-2
I would have this at R+10-12 if Clinton were president. Republicans lost the chance to lock in a 25+ year majority.
Governors: D+6-9
R's lose NV+NM+MI+IL+FL+NH+ME+2 of MD/MA/VT+ one of AZ/GA/KS
D's lose CT and MN
AK is an R vs. I tossup
State legislatures: WA Senate, AZ Senate (possibly through a coalition/power sharing agreement), CO Senate, ME Senate, and NH House and Senate flip. AK House coalition holds, but Democrats still need R/I votes for a majority. All of the R low-hanging fruit have finally flipped, so pretty much all gains will be made by the D's.
And you're basing this on a random special election in Delaware where Democrats spent hundreds of thousands of dollars? lol
No, I have been expecting a modest Dem wave for 2018 since December. Besides, the governing party losing 30 House seats and some governorships and 1-seat state legislative majorities in states Clinton won looks a lot more like "generic midterm" than "massive Dem wave." I am hardly predicting reverse 1894 here!