Republicans have suggested that if billionaire Warren Buffett is going to be the basis of a “Buffett rule” of taxation, then it would seem obvious that perhaps Buffett should be asked to display his tax returns. If he's going to be the exemplar of class inequities, he should lay his taxes on the table. On Thursday night, MSNBC had a mysterious new term for this demand: “Buffett birther.” It has nothing to do with Buffett's birth certificate, but with his tax returns, but don't bother radical-left Georgetown professor Michael Eric Dyson with demands for precision. He guest-hosted the Ed Show on MSNBC Thursday night, and launched his lame new term: SEN. JOHN CORNYN: Well, if he`s going to be the gold standard, so to speak, in terms of what our tax policy should be, yes, let`s look at them. DYSON: