I think the reason Obama bowed was that he was pregnant, and he was also giving a signal to the Ay-rabs that they can kidnap whomever they like and he won't do anything about it. Also, by bowing to the Saudi King, he was indicating that he intends to take all of the guns away and sign the U.S.A. over the the Caliphate.

But it might have had something to do with global warming ....