Democrats to criticize on racism. That's a joke. Harris is my prediction for 2020 nominee. Warren will not...she's White. Biden won't...he has worse sin of all, White,heterosexual male. Bernie won't...he's White. So Harris it is.
Biden and Sanders are just too old. Clinton barely scraped in as young enough, and she was younger and has a longer life span. Look at Trump, who is already senile. That age limit has nothing to do with being white.
Warren, Perez and Harris are all good candidates. Hence, you have to start demonizing them all now. If you want to go after Harris, you could go after the lobbying cash she's accepted.