Democrats are 40% of the voting public.
The Republicans KNOW that they will get their share of legislative seats just by the numbers.
That is why many of them choose to be Assistant Democrats, while allowing the 40% Demoscams to rig "elections".
You are party correct. But on the Republicans....they probably only make up 40-percent. Independents hold around 20-percent of the vote, and are the ones to swing elections one way or another. It was the independents who swung the vote in 1992 for Ross Perot...helping Clinton to win in the end. Same story in 1912, independents went to Roosevelt, helping Wilson to win.
According to Gallup:
In November 2020...
Democrat or Independent Leans Democrat - 48%
Republican or Independent Leans GOP - 43%
In November 2021...
Independents - 41%
Republicans - 31%
Democrats - 27%