Ben Carson is primarily a surgeon. Like many surgeons, he is not modest. He has tried to transform himself into a conservative pundit/opinion leader, but he keeps making blunders. I doubt that he understands how to play the political game well enough to rank high in a presidential primary.
I think of Carson the way I think of Rick Perry: He's a good, solid, conservative guy who should stay in the public eye, stay in the newspapers and on television, but should not run for president.