You lost this "debate" long ago. Now you're not even firing "blanks," now you're trying to re-fire spent cartridges of blanks, and yelling "Yeeeeeeee Haaaaaaaw!" all the louder.
""Article I, section 10, clause 1 of the Constitution provides that No State shall pass any Law impairing the Obligation of Contracts. " "
Would not even "John Galt" agree that "unilateral secession" and "unapproved withdrawal from the Union" equate to "imparing the Obligation of Contract" -- of the US Constitution?
Post something that complies with your own requirements - hypocrite...
;>)