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If Cruz is not president the country is over.
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His ascension to the Presidency would actually be the clear indicator that the country is over as the Constitution would have been completely disregarded by allowing a non NBC to assume the Office.
Aside from that Cruz's conservative principles are not exactly unblemished. His support for increased immigration in order to displace American workers is an abominable position.
Other concerns exist, but for me, I know everything that I need to know about Cruz. He is an unacceptable candidate who has clearly expressed support for policies detrimental to working Americans.