Senator Obama would be the first black president; Senator Clinton, the first woman president; Governor Romney, the first Mormon; Fred Thompson, the first persistant vegetative state president. And Rudy Giuliani would be the first insane president.
Here's some presidential advice from Giuliani's close personal friend and advisor: FOX News bloated corpse, Roger Ailes.
UPDATE: I've expanded this into my Huffington Post article for this week.