The problem wasn't her idea of taxing the rich, it was touting the endorsement of bankers in regards for her economic plans:
"is why Goldman Sachs . . . is why Moody's, which is why Wharton School of Business, which is why 16 Nobel laureates, have collectively determined after analyzing our plans . . . mine would strengthen the economy, his would weaken it." - Kamala Harris
Especially when the one's that endorsed her economic plans can only be described as:
a "great vampire squid wrapped around the face of humanity, relentlessly jamming its blood funnel into anything that smells like money "
Is touting the endorsement of bankers and Bush era war criminals really the most effective strategy that the democrat party can muster?