True.
If they vote the same way anyhow, the turncoat damages the your party orders of magnitude more lastingly.
The turncoat will lower the moral of your base and cripple your party’s ability to draw like minded members. All whilst climbing into a leadership position.
You have to be pretty stupid not to understand this. The founders wrote about it a lot, so you have to be historically illiterate as well.
That’s the problem. Principle vs practicality. Try to win control of the senate even with some RINOS or stand on principle and give Dingy Harry two more years at the helm.