If this election has shown anything, its that there is a massive mistrust of the political elite.
Trump offered change to that.
He is also a cartoon character who says absolutely mental stuff. He is so incredibly thin skinned that when he gets parodied in barely amusing SNL skits, he takes to twitter to whinge about it instead of just getting the fuck over himself, ignoring it and going back to winning the election. To the point where they had to take his Twitter account off him. When he speaks, he doesn't really say anything of true insight or value, just vague "We're going to replace it with something so good, its going to be terrific" type answers.
But then he is incredibly charismatic and does make you feel that as vague as he is, he can actually do what he sets out to achieve.
His opponent was a shady untrustworthy lizard who represented everything people dislike about politicians. She clearly had little to no regard for the working people she claimed to represent and she was completely lacking in charisma. She failed to really be anything other than an alternative to Trump, but an unpalatable one at that.
See the thing that a lot of Trumpfags fail to grasp is that whilst he does have a fantastic amount of support, and was offering genuine change, a lot of Americans couldn't move past all the mental shit he sometimes says, and didn't trust him.
There are plenty of people who want change, they just don't trust The Donald to deliver it.
That and plain old voter apathy.