You just dismissed that entire rebuttal based on some bad faith bs to his quote. Seriously, why is that by him attacking the very very wealthy, of which they are literally buying off politicians to do their bidding, an example of his failure in coalition building? What part of his talking points makes you question that?
Is it him saying "Trump divides us up. We're doing the exact opposite. Blacks, whites, latinos, native americans, asian americans, gay, straight, women, men,...."?
But because he rightly goes after corporate greed waging class war on the working class, he's failing? I don't follow. By not going after them I would say he's failing to build up a coalition that speaks for all of us. Him not speaking up on Israel, means he's failing the Palestinians. Him not speaking up the fossil fuel industry means he's failing the planet. Him not speaking up on the insurance industry and the drug industry is him failing the poor. Him not speaking up on the prison industrial complex is him failing to speak to those of us who have had family members imprisoned for it's racist drug laws, and racist policing.
Sorry, but he needs to attack those who have destroyed our communities.