By ruling class did you mean Barack Obama, because he’s the one who ordered Joe to pick the Ho.
Why did she think she could become president? It goes with being a senator, especially one from a big state.
Why the stories about "staffers of color"? She appointed "people of color," so when they complain about how she's treated by the Biden team "people of color" or "staffers of color" will be prominent in the headlines and the story becomes about race, not about her incompetence or the feud between the Biden and Harris.