Surely no one here thinks Kansas or any other state with such legislation would prevail in today’s court. Even Scalia thinks the interstate commerce clause allows for intrastate commerce to be regulated.
The court would probably roll over and cite precedent or decline to hear a district courts decision to uphold Holder.
Question is what happens if the governor and Kansas tell the feds, go to hell and ignore the court rulings and DOJ and begin arresting federal agents for violating the states laws?
Depends on how far Kansas is willing to push. It would get even more interesting if other states joined in the arrests of federal agents and prosecutions for violations of state laws.
How would it look with hordes of FBI and US Marshalls or worse military troops roaming around five or six state capitals rounding up and arresting governors and state legislators??? PR nightmare for the feds.