It's a gloabally PC greeting. It combines a little from everywhere. I noticed the phenomenon mid-way thru the Clinton regime's gig. It reminds me of something in Star Trek which Spock initiates when dealing with other Vulcans.
Well, it is a very 'egalitarian' greeting; and therefore totally hypocritical as expessed by Kerry and 'Terayza'. . .
and kind of tiresome watching them; not exactly 'effortless effort' on their behalf; more like. ..a 'self-conscious' remember where the camera is. . .