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It's a political perfect storm: The pairing of a government shutdown with the rollout of a big chunk of the health care law is illustrating all sorts of partisan and cultural tensions that are roiling America. Big government vs. small. The Republican Party's identity crisis. Sharpening political divisions among Americans. And plenty more. Dueling images of the government powering itself down just as Americans for the first time are logging on to Obamacare's new health-insurance exchanges bring into high relief a debate that Americans have been having since the birth of the nation. How muc...