Walt Baker, the prominent CEO of the powerful Tennessee Hospitality Association who was a key figure in gaining approval of the controversial $585 million convention center, sent the kind of "joke" email last night -- comparing First Lady Michelle Obama to Tarzan's Cheeta -- that might stop even Michael Richards in his tracks. (The entire email on the jump.) Baker forwarded the racist missive -- introduced with this: "Quoting Larry the Cable Guy ... I don't care who you are, this is funny" -- to 12 prominent Nashvillians, including mayoral legislative aide Toby Compton, Nashville