Varkk: It is the image of a black man following behind a wealthy white woman [his wife], cleaning up etc. It invokes thoughts of slavery from the past. While it is not overtly racist, it has a strong a connection with that time. Certainly plays in to some of those tropes. While it does depict actual people it does show Justice Thomas as being subservient to his wife which may or may not be reality.
And this is why we lose elections. They are real people; it's not a caricature. He is cleaning up after his wife.