You Americans have federal police don't you?
If this dimwit wins his election presumably he'll rather quickly end up on the pointy end of the ATF or FBI. Hopefully they'll slap him down hard before he does any damage.
Well he can't just go out and commit murder. The state authorities would hopefully stop him before the federal one ever has to get involved.
However, if the federal gov did any such thing, rest assured that conservatives would be screaming about this proves the black helicoptors are coming and states rights and all that bull shit.
For a group that talks big on personal responsibility, the conservative echo chamber have a huge victim complex.