Can our nation afford political waffling on issues of scientific consensus? Stan Honda/AFP/Getty Images hide caption

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Grover Norquist, founder of Americans for Tax Reform and the man behind the pledge. Jim Watson /AFP/Getty Images hide caption

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Grover Norquist: Pink Unicorns Aren't Real And GOP Won't Break Tax Pledge

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Americans for Tax Reform President Grover Norquist speaks on Capitol Hill in April. Lauren Victoria Burke/AP hide caption

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