Is Michelle Obama a politician

He is these days, but he was not always. A politician is a person whose primary occupation involves being in politics. Mr. Obama used to be a professor of law and a community organizer/advocate for the poor before he entered politics. But yes, today it would be fair to say he is a politician. It is worth noting, by the way, that the term "politician" sometimes carries a negative meaning, referring to someone who will say anything to get elected: you will hear this on the campaign trail, and both parties use this accusation: "Oh, Candidate X is just 'playing politics'..." or "Candidate Y is acting like a typical politician." But I assume you are asking about the dictionary definition, and according to that definition, Mr. Obama can indeed be called a politician, since his livelihood takes place in the arena of politics.