The only way Obama was objectively radical as a politician and president was the color of his skin.
This is maybe an odd view for an American but it makes sense within a Bangladeshi social context. And democrats are the ones who chose to cultivate an electoral map based on immigrants like my mom in states like Virginia and Michigan.
Sanders is not a member of the party. AOC didn't run for office until Obama had been retired a few years.
You can't really simplify it to such a degree. I believe humans are creatures of action. We like it when things happen. Sometimes, not all the time but sometimes, our morals are downstream of that desire to "be effective". We will align ourselves, no matter the violence we have to do to our own senses, with what is useful.
Specifically, their willingness to skeptically engage with your five-point plan demands that you're actually able to execute it. If you categorically can't make anything happen, then people will cling to an explanation and a morality that can. American democracy has been at a standstill for upwards of 30 years, If the American people have to believe that all their politicians are pedophiles to get some sort of movement again. Then that's what they are going to believe.