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"One well-established fact is that polarization in Congress maps onto one measure better than any other: economic inequality. The smaller the gap between rich and poor, the more moderate our politicians; the greater the gap, the greater the disagreement between liberals and conservatives. The greater the disagreement between liberals and conservatives, the less Congress is able to get done; the less Congress gets done, the greater the gap between rich and poor."      —Jill Lepore (from "Long Division" in The New Yorker Dec. 2, 2013)