If you go back into Bernie Sander's past, you won't find many horrible fuck-ups. Sure, he did party and honeymoon in the soviet union but that's really it - and that's not even very horrible. Joe Biden sided with segregationists back in the day and is constantly proving that he is not the greatest choice for president. Bernie Sanders isn't making fuck-ups this bad. Bernie seems more mentally stable than Joe Biden. Also, the radical left and the BLM movement seems to be aiming toward socialism. And with Bernie being a progressive, this would have been a strength given how popular BLM is. Not to mention that Bernie is a BLM activist.