Comment: I know Texas would be self-sufficient

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In reply to comment: It is most certainly possible. (see in situ)

I know Texas would be self-sufficient

and a lot of other states would be as well. But, an attempt at secession in any state today would cause a civil war. If Obama can muster 60 million votes, he can muster at least half that many willing to die and kill for his regime. Millions of Romney supporters would chop in and help him put down the "rebellion."