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If that's all baked in, there's no-one the Democrats can nominate that will save them. I'm not so cynical - I rather suspect the current media brouhaha will die down and there will be a substantial, hold your nose and vote Biden from the same crowd that unseated Trump in the first place. That said, Biden, and the democrats in general are certainly hampered by not having an alternative media / facts ecosystem, along the lines of Fox, etc. For those that trust them, they have Trump as a successful businessman and president, potentially cheated at the last election and now the victim of political prosecutions designed to frustrate their votes. Hopefully, I don't think that number has grown much since 2016, and he's certainly done nothing to expand the franchise.
Thing is with Trump, everyone knows he lies, threatens, rapes, isn't very bright, is corrupt, is a crook, can't string a coherent sentence together. It's all baked in, none of it's news that they can sell, so he'll never be held accountable for his faults the way Biden is.
No, it's not 'fair', but it's the perception, so it's the reality, and it's why Biden's cooked and needs to gtfo sharpish.