Refine & Enlarge
The good news in a Pew Poll is that a majority of Americans think the Civil War is still relevant to politics today. Unfortunately, by a margin of 48-38% Americans think that states rights, not slavery, was the principal cause of the Civil War, whose Sesquicentennial we celebrate over the next four years. But limited government can't possibly be consistent with slavery. It's best to argue from the principle of equality of natural rights and then proceed to the institutions that defend liberty--otherwise deviations rule.
Lincoln made the case for a constitutionalism of natural rights yet again, 146 years ago, in his last public address, April 11, 1865, when he defended his Reconstruction policies. There are states rights of course; but never at the ultimate cost of natural rights.