This is a very good reason why you can’t succeed with a revolution within the closed two-party system. The parties are the establishment and they are good and well purchased.
It is obvious that many in both parties - as well as the large cohort of Independents - were ready to bolt from status quo politics. But the parties will not allow that to happen from within, their bread is heavily buttered by maintaining tight control of our system of government.
An outside revolution needs to be truly outside.
Good luck replacing his voters