She’s from Californistan, like Kamala Harris. Team Rat already has CA in the bag. Question: how does this help Biden in the Electoral College?
Harris' constituency is low information voters who are only looking for demographic checkboxes. She's the default if everyone else falls through.
Rice's constituency is the Obama administration, and by virtue of that, also NeverTrump. She doesn't bring any states into play, but she brings the Obama electoral machine and the reassurance by the establishment that the socialists won't ruin their old order.
Bass's constituency is the BLM activists. In battleground states like Wisconsin, Michigan, Ohio, and Minnesota, an inspired black activist vote could be the difference between a narrow win and a disappointing loss.