Here is an article concerning the mainstreaming of the concept of nullification, which is being dusted off from the days of Thomas Jefferson, James Madison, and John C. Calhoun.
This is one issue that unifies freedom-loving people from the left (who are resisting unconstitutional federal marijuana laws) to the right (who are resisting unconstitutional federal gun laws). The federal government is too big, too intimidating, too powerful, too expensive, too expansive, and it is time for it to get back into its constitutional cage before it is too late.
Even if you are against marijuana and for gun control, these laws should be passed in accordance with the federal constitution and the rule of law. Governments that are permitted to act above and outside the law quickly descend into the realm of concentration camps, police states, and Orwellian totalitarian bureaucracies. The founders created a federal system of checks and balances - one of which is the check of the states against the federal government. As it stands now, the only arbiter to determine the extent of federal power is the federal government itself. This is antithetical to the very notion of republican government and individual liberty. It is the legacy of Marx, Lincoln, Bismarck, and Mussolini. And we see how it has worked in the international failure of 20th century history. Every one of these advocates of big, centralized government acted "for the good of the people."
So they claimed.
It is gratifying to see the 21st century American people - from both sides of the aisle, as well as those who have opted out of the left-right paradigm - coming together in defense of liberty. Nullification is a peaceful and lawful response to tyranny. And it works! We see an apostolic example of individual nullification in Acts 5:27-32.
For more about nullification, check out this magnificent book. And here is a primer on the various kinds of nullification.
You can read more here.