OutThere:  There are no shortages of demagogues.  History, especially the history of warfare, is rich with them playing "star" roles.  We have nations around the world controlled by them.some are considered "leftists", some are simply self-serving despots who don't even pretend to care for the public welfare.  However, they all amass the power to control the nation,   Max Weber, famous German sociologist, wrote of traditional, legal-rational and charismatic leaders.  Demagogues usually build their base on charisma, then either through a coup or an election, gain and solidify their control.  Once in place, it takes radical action to dislodge them.  

Trump has a charisma which appeals to millions of disillusioned Americans and gives him a very real chance of being elected President.  He's clearly completely unqualified to be President, but, that doesn't mean he can't be elected and morph from "charismatic" to "legal-rational and, therewith, become the most powerful person in the world.