I believe he is afraid he has "blown" his only shot at the WH. People that run and fail,tend to never get much financial support/backing in the future.
Going "national" is something that takes a lot of careful planning,and he just jumped right in with both feet without seeming to have given it much thought.
He DEFINITELY needed some sort of "coaching" to break him of his awkward facial expressions and out of place braying laughter. If he had spent some time working on this before "declaring",he would probably be in a much better position now.
Too much,too soon,and it's going to cost him.