I really doubt that most Trump Supporters are stupid. Most of them have been brainwashed by Terrified Capitalists, Corporations, Religious Organizations, and individuals consumed by GREED.
stupid /stoo͞′pĭd, styoo͞′-/ adjective Slow to learn or understand; obtuse. Tending to make poor decisions or careless mistakes. Marked by a lack of intelligence or care; foolish or careless. "a stupid mistake." The American Heritage® Dictionary of the English Language, 5th Edition •