By pointing out the states rights vs fed issue. The 10th amendment. If he can sell the argument that states can, but the feds have no such authority, he could beat Obama.
Isn’t that a little too sexy for the average voter? /s
Yeah, but, um, we already understand that the states are not as restricted as the federal government (in theory). But we don't like the government telling us what we must do. Period.
The constitutional nicety won't win.