Well, can't remember where I read it, but I think it's a good short explanation to trump's success.
The media takes Trump literally, but not seriously. His voters takes him seriously, but not literally.
So when Trump speaks about a wall across the mexican border, they don't literally think he'll get a wall build, but they do here someone wanting to do something about illegal immigration. Economy, crime etc. is the same pattern.
To me Trump is a hot-air balloon, but that won't keep me from [trying to] understand the patterns behind the populistic movements, we see across the Western World. That would simply be an arrogant and lazy attitude that would get my ideas and beliefs (Social Democracy) nowhere.
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Calling voters stupid and ignorant might be true, but they've always been stupid and ignorant, which means there's something else behind the desire to vote Le Pen, UKIP, Trump etc.