Methinks it was not a joke.
Obama knows he was adopted.
“Whoever” was himself. If he was adopted, his name is Barry Soetoro, unless he legally changed it to Barrack Hussein Obama. If he did change it himself, then HE gave himself the middle name “HUSSEIN”.
If he, himself, has not legally changed his name back to Barrack Hussein Obama, wouldn’t the ballots have to say Barry Soetoro “Barrack Hussein Obama”?
I know it’s a foolish question, because Obama does not have to follow the laws that the rest of us do.