Can you imagine what would have happened to the Dixie Chicks if they'd said something about nullifying the Union?

Secession and Racism By: Glenn W. Smith
And now, just after the inauguration of America's first black president, comes loud talk of secession and nullification. What a coincidence.
It seems like only yesterday that right-wingers were condemning critics of a president as un-American, chanting "Proud to be an American," and branding as traitors to America those opposed to state torture. Today, they say their enemy is America. Oh yeah, and these are the same people who decried so-called "situation ethics."
Texas Governor Rick Perry got quite a bit of attention from his public flirtation with the secessionists during an Austin teabagging orgy. Just the week before, Perry endorsed the quirky "Tenth Amendment" movement and a states' rights resolution. I say quirky, but 23 states have adopted these non-binding paeans to antebellum saber rattling.
Here's a sample paragraph from the resolution adopted this year, by a vote of 43 to 1, by the Georgia State Senate:
BE IT FURTHER RESOLVED that any Act by the Congress of the United States, Executive Order of the President of the United States of America or Judicial Order by the Judicatories of the United States of America which assumes a power not delegated to the government of the United States of America by the Constitution for the United States of America and which serves to diminish the liberty of the any of the several States or their citizens shall constitute a nullification of the Constitution for the United States of America by the government of the United States of America.