This isn't in line with reality. White people in middle america were Sanders' biggest base, he beat Clinton in both Michigan and Wisconsin (plus Indiana and Minnesota too), and he only lost Pennsylvania because it was near the end of the primaries when his campaign was dead. Even so, he beat Clinton in rural Pennsylvania and lost in the cities. Sanders struggled in the South and in places with big cities, he did far better in the midwest. Plus, Sanders polled better than Biden among independent voters in every poll, he was MUCH more likeable to people who didn't have a party while Biden was seen as pure establishment.
Bernie definitely would have outperformed Clinton and Biden both in Michigan, Pennsylvania, and Wisconsin. He would have underperformed them in Georgia. Arizona could have gone either way, he had a much better operation among Hispanic voters than Biden did, which is why he dominated Biden in Nevada.
