From his earliest days, he had decided he "would be" President of the United States some day. He knew that the way to do it was to be elected to the U.S. House of Representatives, then the Senate, then (perhaps) the Vice-Presidency and finally the ultimate prize. His attention was focused constantly on his upward journey and he was mightily distressed when the way seemed to be slowing down.
I have spent many days in the fantastic LBJ Presidential Library in Austin, Texas. It is a wonderment.
One has terrible confusion in reading of his life. One minute he is a terrific public servant, the next he is a wife-abusing, staff-abusing monster.
I think Shakespeare would have had a great joy trying to define LBJ.