Billionaire Tom Steyer, a former hedge fund manager, would appear to be an unlikely messenger for a Democratic Party debating racial and gender diversity, generational change, and inequalities in society, but his status as a one-man “super PAC” is setting him up to be a deeply disruptive figure in the primaries, The New York Times reported on Tuesday. Steyer has spent $12 million on digital and television ads in only six weeks — more than any other Democrat has spent all year, which has made him a familiar face to many.