What's a political ad? Better yet, what's a NON-political ad?

If McDonalds advertizes how good and healthy their Big Mac is, is it political? What if someone complains that it contradicts some pending legislation? What if someone complains about the racial make up of the cast in the ad? What if the ad mentions a word that later someone complains about?

We live in a nation where we can't agree on what a man or woman is, and what that means. In fact, just talking about it is now political.

So, who's going to judge whether something is political or not?