Joseph G. Lehman, president of the Mackinac Center for Public Policy, speaks at a Show-Me Institute event on Tuesday, April 7, 2009, in Columbia, Mo., about the importance of free-market think tanks in helping to shape the intellectual and cultural ideas that ultimately determine public policy.

For more information about the Mackinac Center for Public Policy, please visit its website.

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Part 1 (9:37) | Part 2 (9:40) | Part 3 (9:28) | Part 4 (8:08)