ShoulderOfOrion (April 16, 2014)
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Linda Lyons (January 4, 2005)
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Y Combinator (12/06/2016)
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Martin Gilens, Benjamin I. Page in Perspectives on Politics (Fall 2014)
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Paul Waldman in Washington Post (February 24 2015)
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Sarah McKibben in ASCD (October 2015 )
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Clare Malone (JUL 18, 2016)
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Mark Green in Washington Post (January 21, 1979)
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Kevin D. Williamson in National Review (March 28, 2016)
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Norman K Risjord in Columbia University Press (1965)
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David Blankenhorn (February 17, 2016)
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Various in United States Federal Government (June 14, 1923)
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