Numerous. AOC has improved, but she has an extremely difficult time naming and addressing racism. She and Bernie went on a tour to fight oligarchy. They did not fight bigotry & hatred, which is why we have so many more oligarchs and why their net worth has surged so much since Civil Rights.
I voted for Bernie twice, but he is very race-mute and it has cost him big in black support. He has a big blind spot of the role bigotry plays in causing the problems he accurately summarizes. Bernie doesn't grasp why it is that so many working people will never vote for the measures that help them.