Why does Obama exist?

I do not think that even Immanuel Kant could answer this question. Everything seems to have some purpose or function in life. Although George Bush was also a bad president, he was at least funny and comedians could make you laugh about him. Even poop has an important role in the ecosystem. But I cannot identify even one trivial purpose or function for Obama. Yet he is president of the USA. Can anyone explain this insanity?