someone who gets rich and then gets into politics; or someone who gets into politics and THEN gets rich? As Harry Truman said, you can only get rich in politics by being crooked.
Most rich people, like Soros, Buffet, Schmidt, and Bezos, are content to buy influence. Her blatant and shameless hypocrisy notwithstanding, Hillary would have much less money without Citizens United. It will never be overturned because it is good law. She just fulminates against it because it sounds good. Money in politics has been very, very good to her.
Trump is in this for two reasons only; he sees a screwed up country and believed he can fix it; and he has always sought out challenges.
I was tempted to say he likes attention, but getting dragged through the mud by every network on the planet is not exactly a good time.