The Despicable Rush Limbaugh

A friend sent me this link: http://www.alternet.org/blogs/peek/50979

I agree with this commentary:

This is a head-shaker. Imus gets canned for calling some college women basketball players "nappy-headed hos" and yet Rush Limbaugh plays "Barack The Magic Negro" on his show and he is still on the air?

How is that even possible?