During the candidate debate in South Carolina, Donald Trump said some ugly things about the most recent GOP president, George W. Bush. They were the sort of things you'd expect from a Democrat, allegations that W lied about WMD and failed to prevent 9/11.
It will be interesting to see how those comments play in the SC primary, it's a state that likes W. If Trump wins SC - not just narrowly but decisively - we will have learned something interesting about the Republican base.
It would show they have accepted the MSM's verdict on the Bush II presidency, that it was a failure. We will have learned there is no political mileage in defending W's record, perhaps even a cost.