The primary’s on Saturday the 21st. He’s promising to endorse on Thursday the 19th at the Southern Republican Leadership Conference, which happens to be hosting a presidential debate that same day. He’s timing it for maximum impact, in other words, right down to his choice of which primary to target: As a Georgia native, he might have a bit more sway over voters in SC than he would have had over Iowans, assuming he has any sway left over anyone. Question: Who would value his endorsement the most? Perry’s desperate for positive buzz of any kind but Cain’s already ruled...