Good Day mortimerjackson
This is a really important consideration. I believe we Americans do have some trouble with this concept. Political satire IS the act of making fun of the powerful in any society, because it is they (the economically, socially, politically powerful) who can best "take the hit," as it were. Their power and wealth are a very soothing balm for them; and they can take immense comfort in the fact that everyone envies them immensely and want to be like them.
Satire IS NOT the act of powerful people making fun of individuals, groups, and communities who are economically, socially, and/or politically marginalized. That is because -- to oversimplify a bit -- they are already beaten down enough by society, to make fun of them (in a top-down manner) is to "rub salt in their wounds." That's not funny, it is meanness!
I mention this because you often get the latter situation, certain people make insensitive statements about marginalized people and they, often rightly, get fired from their positions as news program anchors, radio disc jockeys, etc (positions that give these folks some cultural power).
It is clear that these poweful people had made these remarks under the cover of "satire" because when they lose their jobs they decry our "culture of political correctness." So we often confuse top-down meanness with bottom-up satire.
But to your specific reference, yes, we should recognize your query (Was Barack Obama born on Earth?) as satire, in that it is an extension of the (Was Barack Obama born in America?) propaganda. But you are NOT making fun of Barack Obama; you are making fun of the thinking of powerful, politically reactionary elements in our society who are guilty of spreading that propaganda.
Take it easy.