Martin O'Malley, the Democratic governor of Maryland who is almost certainly running regardless of what Clinton does, is a guy Booker thinks about and even brings up voluntarily.
"He will be a presidential candidate," he says in his office, with great assurance. "It'll be him versus Hillary! He was such a good mayor," Booker adds.
O'Malley is, in part, Booker's predecessor — both effective and young and charismatic mayors in cities suffering from crime and drugs.
During his seven years as mayor of Baltimore, O'Malley developed the successful crime tracking system, CitiStat, that Booker saw as a model when he first entered office in 2006.
Of course, if Booker does, indeed, unseat incumbent Senator Frank Lautenberg, he'll immediately get presidential attention, and he probably won't be hating it.