Bill Clinton was born under the sign of Leo the Lion. Obama put a big thorn in his paw. I don't know if he's racist or not, but the unforgivable sin was parading it as the truth all around the world. Bill Clinton is nothing if not proud...and he has a vindictive streak, plus you can't really blame the guy for being protective of his wife.
Obama really needs to watch out, he's an amateur playing a dangerous game with the master of politics.
The irony is that Bill is reaping what he has himself sown, because he did the same to his opponents back in the day. It's not so comfortable when the shoe is on the other foot.