Alot of centre-left people are going to stay at home. The democrats disgraced themselves with their lurid 'trust women, hang him high w/o evidence' mob circus. Particularly if they take heed of some of these women quietly withdrawing their claims on BK, reports of which the media is typically keen to downplay.
I would say judging by all available data that republicans will increase seats in the senate by 3 and hold congress by a slim margin , if you take into account they are incumbent party it’s a huge statement
Polls close earliest in Indiana and parts of Kentucky in a little over 6 hours, at 6pm EST. Then we will know immediately if the young democrats came out and Trump is screwed. Kentucky being the better indicator imo.