

The DNC cannot be entered and changed into a working class party because they too get their base from the bourgeoisie.
I think this is too pessimistic, especially in light of how bad all other options are for the left. Party bases change – Democrats used to be a lot closer to the working class, and (decades ago) delivered major policy improvements. With a lot of jobs re-proletarianizing, who’s to say the party base can’t shift back?
The biggest barrier to such a change is campaign donations, of course. But Bernie showed you can fund even a major presidential campaign through small donors, and we’re also at the point where corporate Dems have more money than they can effectively use (see the Harris campaign).
Several? How big was your elementary school?