That’s a nice thought, but it won’t happen because the ratcheting effect of primarying out moderates only works in one direction, rightward. This is because corporate donors are just as happy to fund fascists as they are moderates.

In contrast, progressive candidates often don’t stand a chance because corporate donors fucking hate them and will spend effectively unlimited amounts of money to destroy their chances, especially if they make regulation and oversight of corporations a big part of their platform. Ditto for the police “union[sic]” and police reform, or AIPAC and opposing genocide, for that matter.