so it's not just about Kamala, but a system failure. Beto is a white guy best known for fighting for non-whites, and he also failed to gain traction.
Iowa/NH, two small white states, help to set the narrative - no suprise that the top 4 candidates are whites who suit the tastes of middle America.
When Iowa picked Obama alot of that was hatred/sexism against Hillary, also about the Iraq war (that Obama was against), also in a time way before Birtherism and Trumpism. Obama would not get elected in this climate, where whites in both parties have moved more towards a racially conservative direction.
primary today, I would vote for: Joe Biden