Obama thinks he was a humanities major, but he wasn't.
Political science, like history, is not, generally speaking, one of the humanities. Art history isn't either, but that's beside the point. Humanities include English, foreign languages, literature, etc. Muddled thinking like this is characteristic of Obama's utterances, which expose the shallowness of his ideas--glib but essentially meaningless. Obama appears to think that any field of study which is not STEM is "humanities"--or if it isn't it doesn't matter. It's close enough for government work.
The use of precise language is important to critical thinking. Critical thinking is essential to understanding what is being discussed. In other words, ideas have consequences, and muddled ideas have negative consequences. But what would Obama know about critical thinking?