Getty/HandoutThree years ago, the Tennessee state Senate voted of 20-to-9 to keep July 13 a Day of Special Observance marking the birthday of Nathan Bedford Forrest, a millionaire slave trader, Confederate general, mass murderer of more than 200 Black Union POWs, and the first grand wizard of the Ku Klux Klan.The legislature did remove a bust of Forrest from the Capitol and Gov. Bill Lee stopped issuing a proclamation on Forrest’s birthday. But Tennessee continued to observe July 13 as Nathan Be