White solidarity is extremely important with this group. To wit, high level Democrats including Biden can't stop sucking up to Republicans while exclusively blaming Trump and "MAGA Republicans" for everything that goes wrong, notwithstanding that the entire GOP are "MAGA Republicans" who support Trump at this point.
Biden also appears comfortable taking hard right turns on policy even as it hurts him with core Democratic constituencies as long as he has Trump to scare voters into submission.