I picked my major to be political science because fortunately I grew up in Bay Area, it was a very politically involved community that got me interested.
The first reason is that because of actually Obama so the unemployment rate went down, and the other accomplishments from Obama, Trump will and has lied about and took credit for.
The second reason is religion, fundamentalism, and the anti sexuality/reproductive rights of American society. Americans have been looking for a politician that can legislate sexuality for years and the idea that Trump could make gay people afraid to come out of the closet or make people more celibate attracts the vast majority of Middle America.
Third reason is marketing. Trump is a marketing genius, that knows how to bullshit the public mass. He uses social media, to his advantage and has other popular radio, and tv hosts, celebrities in great support of him such as Ben Shapiro, Milo, Steven Chowder.