"Happy Kwanzaa to those citizens who celebrate it" would have been enough.
If Klansman David Duke had invented a white separatist holiday in 1966 called "Klanzaa", had his Klansman murder 2 rival white racists in the hallway of a college student union, and then joined 2 of his Klansman in torturing 2 young girls with a soldering iron, a vice, an electrical cord, and caustic detergeant and then spent 5 years in prison for doing it, and if David Duke was now a self-proclaimed marxist who continues to spread his message of marxist white separatism - would you think it would be acceptable under any circumstances for George Bush to have said: "Happy Klanzaa to those citizens who celebrate it"??
No, I didn't think so.