Faith writes:
YOu seem to be ignoring the main overall fact about Midterm elections which is that they always reverse the wins of the incumbent administration, and in this case Trump fared a lot better than previous Presdients, Clinton losing 52 house seats and seven Senate seats, Obama losing 63 House seats and some number of Senate seats, and something similar was true for the Bushes, while Trump lost only 30 something House seats and actually gained a couple or three Senate seats.
There is one number that stands out
"The gains that propelled Democrats to retake the majority in the House come on the back of the largest margin of victory, in terms of total votes, that either party has seen in a midterm election. Democrats held the prior record for vote margin, which came in 1974 with the backdrop of the Watergate scandal."
https://www.nbcnews.com/...-tally-losing-gop-rep-mia-n940156
The House elections are as close as you get to a national vote in a midterm, and it was the largest win by either party in modern history. What Democrats face is gerrymandering which is why they didn't have the largest seat win.