Substituting for McGraw Milhaven on KTRS (550 AM) Tuesday morning, St. Louis Post-Dispatch columnist Tony Messenger came out swinging when a caller insisted on calling Muhammad Ali by his birth name, Cassius Clay. Ali, the legendary boxer and outspoken activist who passed away last week, changed his name in 1964 after converting to Islam. But that didn't seem to register with the caller, identified only as Barry from Potosi, who began his question, "I can't quite understand the news media going absolutely berserk over Cassius Clay.…