Nullification is an old pipe dream. The Constitution clearly says that federal law trumps state law. This is a stupid waste of resources and money better spent in getting laws repealed, changed, or enacted, that are not jousting at windmills.
Well, it's worked so far with the Real ID act.
Look up some of Tom Wood's recent speeches on nullification and you'll be amazed at how many times it has been used to put the federal gov back in its place. The problem is that the people just forgot about it (or didn't have the guts to do it) for about a century - big mistake.