Ironically, the progressive movement’s work to build its own political infrastructure may have been inadvertently accelerated by a policy designed to suppress the party’s insurgent wing. In March, the Democratic Congressional Campaign Committee announced a new policy to blacklist any firms working for primary challengers, effectively protecting the party’s white, male incumbents in safe blue seats.

https://theintercept.com/2019/06/13/alexandria-ocasio-cortez-campaign-training-school/