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Holy stare decisis, Batman, didn't SCOTUS also hold that the Constitution is not a suicide pact? That would make an interesting argument for secession.

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And I'd think the Declaration of Independence would hold more weight than the Pledge of Allegiance, and the Declaration surely holds the exit clause:

"--That whenever any Form of Government becomes destructive of these ends, it is the Right of the people to alter or abolish it, and to institute new Government ... it is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security."