posted by gutAgain, I'll say people are so polarized - and angry - that turnout is a complete guess. These models always come down to their predictions on turnout (or at least its distribution), and I don't think any past results (they usually rely heavily on what the last midterm or two looked like) will be indicative.
If Kac gets confirmed, will the anger be sustainable on the right? The left will be more angered, but likely the people who are angry were already going to vote. Something to watch for.