You noticed too.
Did some research online about narcissism and viewed a number of videos by the guy who is probably one of the top experts in the area of narcissism.
Obama and Trump are perfect examples of malignant narcissism; and so were Hitler and Stalin. All these people mesmerized by Trump don’t see how Trump has manipulated them.
As for the huge crowds Trump is drawing, it is a perfect for a mob mentality to take over. Place a number of rable-rousers in the crowd to start rallying the crowd and people lose their senses. Worked for Hitler, Stalin and lots of religious leader scammers; Benny Hinn being one of the worst.
For those Trump supporters who think they would never fall in emotional love with a Hitler are doing the exact same thing Germans did with Hitler.
Hitler got his supporters emotionally committed to him no matter what he said. Hitler promised them almost exactly what they wanted to believe about him, and learned too late they were decieved by a master manipulator.
Here is an excellent video on malignant narcissism.
https://m.youtube.com/watch?v=x54z2pRAvtg