“I think the ‘polling averages’ are going to end up (on average) underestimating the Republican margins by a net of 5%,” Mason-Dixon Polling Managing Director Brad Coker told The Daily Wire in an email. “I think the GOP will end up with 54 Senate seats. I don’t track House races district-by-district, but I generally think the Republican Party will net a gain of somewhere between 25 and 35 seats.”

https://www.dailywire.com/news/analyst-election-polls-underestimating-republican-margins-by-5