Pot callin the kettle black
I think Mik had it right -- I think he was referring to the question of whether Mr. Obama is a "natural-born citizen", as required by the Constitution.
The site you pointed to offers this definition (among others): "Any one born outside the United States, if one parent is an alien and as long as the other parent is a citizen of the U.S. who lived in the U.S. for at least five years (with military and diplomatic service included in this time)." Even if one believes (as I don't) that Mr. Obama was born in, say, Kenya, if we accept that his mother was a U. S. citizen who lived in the USA for at least five years, then he's a U. S. citizen by this definition.
But I believe he was born in Hawaii, so "Anyone born inside the United States [and subject to its jurisdiction]" does it for me.
None of this will satisfy the noob, though, I expect ....