Samuel Medary presented a very detailed message about why he was vetoring a bill prohibiting slavery in Kansas that had been passed by the territorial House of Representatives. This printed document contained a long discussion about the sovereignty (or lack thereof) by the federal government, territories and states and how that applied to the institution of slavery. He ultimately argued that the law passed contained no means of enforcement but only enacted the "declaratory" statement about slavery contained in the Wyandotte Constitution.
Kansas Memory
Kansas Historical Society
Governor Samuel Medary, veto message on the bill prohibiting slavery in Kansas. - p. 6