Even Lenin said we should engage in electoral politics.
i'm an anarchist, but i've still read a bit of lenin. in fact one of the polemics of his that i've read was 'left wing communism an infantile disorder', the text you're paraphrasing.
his point was about using bourgeois parliaments as a platform for revolutionary agitation and exposing their limitations as a part of a workers movement. it was not about supporting bourgeois parties or treating elections as the primary terrain of struggle. invoking that in support of voting for democrats is a distortion of what the polemic was about.
Not every place is fortunate to have a DSA or PSL, so we must do the best we can. Everyone who defeated imperial powers did it over the long term not on a blitz.
this is exactly why i prefer to devote my energy to making sure that my neighbors can eat and protesting against democrats capitulating to republicans. i don't see those problems going away after a successful election, even when democrats have a supermajority they find a way to do what republicans want.