Even so, I’m not sure I can agree that the best solution to dealing with the right is to fight the centrists first
We aren’t able to use electoralism to fight the right as long as the political platform and messaging of the democratic party is 95% the same as the republican’s.
People elect representatives to represent them, not to compromise and pass the opposition’s agenda.
It’s forgivable if the representative failed to obtain enough power, but if they have literally any means at their disposal and don’t use it, an unwillingness to use all the power the people gave them to do what they elected them to do is a betrayal of those people.