State nullification is Thomas Jefferson’s idea, derived from the Richmond Ratification Convention of 1788, that the states must refuse to allow the enforcement of unconstitutional federal laws within their borders.

Here’s an overview of nullification.
Here are answers to common objections.
Here’s how the mainstream media treats nullification.

Here’s my book Nullification, with endorsements from Judge Andrew Napolitano, Walter Williams, and Barry Goldwater Jr.

And here I am explaining the idea at the January 2012 convention of the Constitutional Sheriffs and Peace Officers Association: