IMO Oberving IS by wishing everyone *Happy Kawanza Day* why even mention it?
Unfortunately, your opinion doesn't make it so.
I suppose that he mentioned it because, in no particular order, a) it is a holiday that some Americans observe, and b) by mentioning it he deprives others of the opportunity to call him/Republicans racist. I would think conservatives would have a whole lot more to do than join DU in bashing the President.
Does anyone know: Did Ronald Reagan send out Kwanzaa greetings?
Because its observants are American citizens just like you are, and he is their president just like he is yours.