What you are seeing is an army of high scoring Right-wing Authoritarian followers following one of the most virulent Social Domination Oriented person that has come down the pike since the late 1950s (when I became interested in politics.) [I have hubs on both personalities if you are interested.]
This is a deadly mix that can, and has, led countries into Hell. The prime example is Adolf Hitler and his Nazi Party. Now, I can't say Trump is as bad as Hitler, nor can I say he isn't; but I can say that he generates the same blind enthusiasm from his followers that Hitler did with the German people.
The only test we have available to see how strong a hold he has is to watch the results from the 1st Super Tuesday primaries. It may be moot, because even if he fails, Trump as a surrogate in Senator Ted Cruz who probably scores almost has high on the SDO scale as Trump would.