Because Obama has a huge staff. No pun intended.
It was mentioned weeks ago that his team was twice the size of Hillary's campaign team. Obama is a "superstar" because he has so many favors cashing in right now, he has made lots of people money. He is a media sensation, and it is all marketing.
He just added a third plane to his entourage since his acceptance speech, just for reporters. He is even stepping it up!
People have to realize its not about the candidates, its about the people they surround themselves with.