"The right of the people to keep and bear arms shall not be infringed." If the government says that I can't have a gun unless I pay a tax, buy insurance, ask its permission, or jump through other hoops, then it's no longer a right -- it's demoted to a privilege. Any law introducing such requirements is unconstitutional.
Me
"All laws which are repugnant to the Constitution are null and void."
Marbury vs. Madison, 1803