Muhammad Ali became in September 2012 the first sportsperson to be awarded the Liberty Medal.
From the citation:
Muhammad Ali is a champion of freedom who embodies everything the award was established to honor: individuals of courage and conviction who strive to secure the blessings of liberty to people around the globe. He has long served as an icon of the American dream—while challenging and expanding the very definition of “We the People.”
More information: constitutioncenter.org/libertymedal/