If the nation as a body walks away from God's precepts that nation gets vipers and those who have evil in their hearts in as leaders.
We are already run by vipers with evil in their hearts. The New York Times, to name one. The Washington Post. AIPAC. K Street. But that is a political failing. Not a religious one.
God doesn't care about nations. Or neighborhoods. Or baseball teams. Or corporations. Or whether a drought ruins your crops, or the stock market crashes, or the town hall has a Nativity Scene or the local courthouse displays the Ten Commandments. None of those things has anything to do with RELIGION, which is utterly and completely concerned with the realm of how we treat one another. How I treat you as an individual. How you treat me as an individual. Nothing else has anything to do with religion, nor, by extension, with God. Did the Supreme Court legalize gay marriage? God doesn't care. It's a political and a cultural question (i.e. Art), not religious.