Obama's do-as-I-say-not-as-I-do hijinks have ample precedent, of course. All false messiahs I know of have suffered from that attitude. Here is just an example from one of his spiritual predecessors.
This a poster from the early Communist era in Czechoslovakia. It says: "Comrades, it's time to put an end to boozing."
Uncle Joe, to use Winston Churchill's nickname, was of course a boozer par excellence.