Rewriting "just for no reason whatsoever"
The girlfriend, Aia Cooper, who was voting in the booth next to Obama, was humiliated, to say the least. "I really wasn't planning on it," Obama joked with the woman. "There's an example of a brother just embarrassing you, just for no reason whatsoever."
I really don't know why there's "whatsoever" in "just for no reason whatsoever." in the quote. Does "whatsoever" mean something? Or is it just for emphasis? So I rewrote the phrase as the following. Can you check these sentences and which is the closest to original text in meaning?
"There's an example of a brother just embarrassing you, just for no real reason."
"There's an example of a brother just embarrassing you, whatever the reason is."
"There's an example of a brother just embarrassing you, just for no any other reason"