Prost!

I just witnessed something very interesting ... at a luncheon in New York today, President Obama just offered a gracious toast to the U.N. Secretary General, Ban Ki-moon ... then didn't drink his toast.  He very conspicuously set his wine glass down at the table without even bringing it to his lips for even a sip.  This seemed to me a very curious departure from protocol and even good manners.  I do understand why the President may not want to indulge in any significant alcohol consumption given the importance of his scheduled meetings at the U.N. today ... but not even the tiniest sip?

What does this mean?  He doesn't like Ban Ki-moon?  He doesn't tolerate white wine well?  He hates such protocol obligations?  He is a teetotaler?  And, choosing the most sensible option ... that he, like George W, Bush, is a teetotaler, why is this so?  We know, by his own admission, that he was an illicit drug user in his youth, so alcohol avoidance must not be a religious stricture.  Perhaps Michelle has even a shorter leash on him than just for his cigarette smoking?  (See: Huffington Post Storyl.)