Young. AA. non-ideological. "Potential" to deliver strong speeches. Charismatic.
This is the correct answer.
Personally, he has limited appeal to me because he is a right-wing corporate shill.
He's the former Mayor of Newark, and he's the current junior Senator from NJ. As NJ is one of the most corrupt states in America (for Dems and GOP alike), I would dread him on my national ticket due to what shoes may drop.
Booker has a reputation for being clean, at least by New Jersey standards, and for having strong character and belief in what he's doing. The problem is that his actual views are too 'finance capitalism with socially liberal characteristics'.