Right now there are two very different narratives playing in the minds of partisan voters. On the left, you have the narrative about Russian collusion, Trump's corruption, etc. On the right, you have the narrative that the Russian collusion narrative is a smokescreen put out by corrupt elements from the justice department and the intelligence community. I don't see a whole lot of middle ground between the two narratives, and I suspect one side or the other will have been disappointed by election day, which would have a significant impact on the election if it happens.
I don't know which side that will be (heck, maybe it will be both sides), so I'm not sure what to think about the midterms just yet.