It starts around 1:00 on the video posted below.
& another one...
This time in China to President Hu Jintao.
Why would you not bow to royalty, say the Queen of England but go around in a bowing frenzy when etiquette does not require you to and certainly not if your President. As former VP Cheney said, a President is not required, nor is he expected to bow. As I mentioned in the previous post, not only is it humiliating but the perception is more detrimental than anything else. His toe touches give the impression of weakness.