Policies aside, people like Booker, Rubio, Gillibrand, John Edwards, etc. all make one feel like they've roadmapped their way to the presidency since age 15. The kids with the My First Presidency toy set. The ones who want the next position up because they've been that sort of striver since student body president was dangled as an accomplishment to put on a college resume, and little reason more.
We knew the moment Booker won in Newark he wanted to be Governor or Senator and then President and wouldn't be wasting his time with things like "governing".