Jonathan Zasloff makes the case:
Booker is an extemely effective mayor: for the first time in decades, Newark went an entire month without a homicide, due in large part to Booker’s innovative law enforcement and community organizing strategies. He is extremely intelligent: a Rhodes Scholar and a graduate of Yale Law School. He has important experience, both practical and legal: he served as a staff attorney at the Urban Justice Center in New York City and no one has done more in such a short time to reduce violence in America’s urban centers. His work has achieved praise even from conservatives.
I think Booker will absolutely be president one of these days. Of course, I also think he'd make a fantastic supreme. This is a fight I would love to have with the Republicans. My only worry is how badly it would damage Mayor Booker should the effort fail.