Could there be any odder couple than Rush Limbaugh and Al Sharpton? Not if I have anything to do with it. Last week - after Matrix Media announced a deal for Sharpton to host a "Limbaugh of the Left"-type talk radio show - the conservative radio star said he'll think about mentoring the minister in the finer points of the medium. Yesterday, Sharpton contacted me to say he's eager to accept the sort-of offer to (as Limbaugh put it on his own show Friday) "let [Sharpton] guest-host the program for, like, 30 minutes at a time while I am sitting...