Did Pennsylvania or New York or Maine have that in their constitutions? How many "Northern" states did have those laws and of those that did, how many enforced them?
BTW. If states rights were so damn important for guys like Davis, why did he support the FSA and Dred Scott so strongly? They both trampled the hell out of states rights and individual liberty.
Even Lincoln supported the Fugitive Slave Act as being constitutional. How is it not so? States rights refers to rights not delegated to the Federal government. As Lincoln said:
I suppose most of us (I know it of myself) believe that the people of the Southern States are entitled to a Congressional Fugitive Slave law,—that is a right fixed in the Constitution. But it cannot be made available to them without Congressional legislation. In the Judge’s language, it is a “barren right” which needs legislation before it can become efficient and valuable to the persons to whom it is guaranteed. And as the right is constitutional, I agree that the legislation shall be granted to it,—and that not that we like the institution of slavery. We profess to have no taste for running and catching niggers,—at least, I profess no taste for that job at all. Why then do I yield support to a Fugitive Slave law? Because I do not understand that the Constitution, which guarantees that right, can be supported without it.