Karl Marx said parliamentary cretinism would get the workers everything they wanted in America. And the present Potus repeatedly befriends communists and identifies as one.
KARL MARX in 1871 - Parliamentary cretinism will get the workers everything they want in America and England.
https://www.marxists.org/archive/marx/works/1872/09/08.htm
“… we do not deny that there are countries – such as America, England, and if I were more familiar with your institutions, I would perhaps also add Holland – where the workers can attain their goal by peaceful means…”
The real question for the DSA is whether an organization that has channeled almost all its energy into electoral work can generate that kind of outside pressure at all or only ever hopes to be the parliamentary wing of a movement it isn't building.