So, the three qualities of a workplace that would develop people would be information sharing, investing in the training of the workforce, and giving employees the ability to use their training and information to make decisions.
I do not think anyone who ever saw Lyndon Johnson give a speech would call him charismatic, even though he was one of the most effective presidents in U.S. history. Same with Lincoln. Charisma is only one source of power, and probably not a very important one, at that.
I would give Obama a "C." He gets an "A" for understanding this country's profound problems in education, health care, infrastructure, and economic competitiveness, and for surrounding himself with extremely skilled and knowledgeable people who know what to do. He probably gets an "F," ironically, in his ability to sell these ideas to the American public and to be angry enough, conniving enough, and frankly mean enough to get them implemented and understood.