Only in California... Reading the lyrics, Clinton, I don't think blacks would be offended by it. The term "spade" (which is as up to date as "Twenty three skidoo" or "cool") was not usually meant as a derogatory term, way back in the sixties. Not having heard the word used in forty years, I suspect that it wouldn't have much of an impact, one way or another. The song sounds GREAT! Do it. You never know who you'll offend. But, I think that people respond to a song or something that's said in the context of how they view the person. As long as you don't have a red neck, white socks and a bottle of Blue Ribbon beer, they'll most likely cut you any slack you need. Come to think of it, that song is insulting to dumb racists.. :-)
Jerry