The 45th president is not the first to arrive in office full of hubris, thinking he's the smartest person in the room. Most presidents get over that. After a year-and-a-half in office, with his agenda stalled, President Bill Clinton empowered a new chief of staff, Leon Panetta, to whip his administration into shape. Despite his shaky start, Clinton cruised to re-election in 1996. It took Jimmy Carter 2½ years to realize that he had to appoint a chief (before then, Hamilton Jordan had been his reluctant, de facto lieutenant). Carter did not find the right person until his final year in office, when he tapped a brilliant lawyer and ex-Marine named Jack Watson.