Obama's mother Ann Dunham was quite a girl

Compare this look to her more formal pose on wikipedia!

Stanley Ann Dunham, the mother of Barack Obama, the 44th President of the United States, was an American anthropologist who specialized in economic anthropology and rural development.Wikipedia

I'll say she did!

Obama looks just like his 'mentor' Frank Marshall Davis from Chicago.  It is said that both his parents were CIA agents.  It could be that Obama was a real American after all through his actual undeclared parentage, making his place of birth less relevant.  Shame the paperwork doesn't fit the story though.  That negates his US nationality via parenthood.