Within a few pages of the new book:
"He could come across as cocky, that was for sure. He knew he was smarter than the average politician and he not only knew it but wanted to make sure everyone else knew it, too. He would interrupt aides at meeting, saying Look (he does this all the time) and be off to the races, reframing the point, extending it and then claim ownership of it. "Whose idea was that? Was another of his favorites, employed with cheerful boastfulness whenever something he'd previously proposed had come up roses. His calmness and composure would veer into the freakish,., and sometimes concealed gaudy confidence in himself. When asked if he was nervous, Obama replied "I'm Lebron, baby..I can play at this level. I got some game".
In other words: he claims credit for others' ideas, brags when "his" ideas turn out to work and -when he is not unnaturally apathetic (oh..sorry..calm) he is filled to the brim with hubris and ego.