Mackinac Center President Joseph G. Lehman appeared on "The Glenn Beck Show" on Fox News Channel Wednesday evening to discuss the Overton Window of Political Possibility, a theory created in the mid-1990s by Joseph P. Overton, the Center's late senior vice president.

Beck's new book, "The Overton Window," was released June 15 and already tops the bestseller list.

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Lehman was a guest on Beck's nationally syndicated radio show on June 9. Beck also wrote a commentary about the Overton Window, which you can read here.

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