Not only did he bow ...

Barack Obama did indeed bow to the king of Saudi Arabia.
He also genuflected!
You can clearly see him bend his right knee. The dictionary
defines genuflect as
"to bend the knee or touch one knee to the floor in reverence or worship".
PBO did not touch the floor, but he clearly bent his knee as
he bent forward. We can not know his heart at that moment,
so we do not know whether the act was in reverence or worship
of this Muslim king. If not, it is really strange that PBO will go so
far beyond the established protocol.