There is a lot of speculation on what happened to the Red Wave, but I am reminded of the old Japanese monster movies, where Godzilla and Mothera fight it out and Tokyo gets stomped to rubble in the process.
Both former President Trump and Sen McConnell controlled huge sums of advertising funds and used them to thwart each other’s candidates or to build a war chest for their own future purposes. Both Trump and McConnell raised funds in States with close Senate races, sucking the money out of donors, and then either directed those funds elsewhere or in Trump’s case, held those funds for his planned Presidential run. McConnell was just as bad, defunding campaigns where the candidate was supported by Trump or simply would not pledge to support McConnell as party leader in the Senate.
In both cases, the Senate candidates would have been better off if McConnell and Trump had never entered their states to suck up the funds.
So, to a large extent, the GOP got trampled by a pissing match between competing narcissists who forgot what the election was really about. It’s time for both of them to fade away, or failing that, be rejected by their party.