I don’t consider Trump to be a genius. He was perceived as the closest thing to a representative for the millions of Americans who’ve felt unheard and ignored over the past eight years. Some of his supporters readily admit that he isn’t perfect, and don’t agree with many of his decisions and character flaws.
But they felt any change was better than more of the same, and perhaps viewed supporting him as a way to voice their anger and disapproval of ‘elites’ and politicians. If he even came close to addressing their concerns (terrorism, outsourcing, illegal immigration), they felt it was the worth the risk to elect an unpredictable, unconventional president.