Sam Waterston, Cat Stevens, The Roots: Rally to Restore Sanity Performers » Ozzy Osbourne, Yusuf

Rocker Ozzy Osbourne and folk artist Yusuf (formerly Cat Stevens) wave to the crowd during  the Rally to Restore Sanity and/or Fear on the National Mall in Washington, Saturday, Oct. 30, 2010. (AP Photo/Carolyn Kaster)

Rocker Ozzy Osbourne and folk artist Yusuf (formerly Cat Stevens) wave to the crowd during the Rally to Restore Sanity and/or Fear on the National Mall in Washington, Saturday, Oct. 30, 2010. (AP Photo/Carolyn Kaster)

Rocker Ozzy Osbourne and folk artist Yusuf (formerly Cat Stevens) wave to the crowd during the Rally to Restore Sanity and/or Fear on the National Mall in Washington, Saturday, Oct. 30, 2010. The “sanity” rally blending laughs and political activism drew thousands to the National Mall Saturday, with comedians Jon Stewart and Stephen Colbert casting themselves as the unlikely maestros of moderation and civility in polarized times.(AP Photo/Carolyn Kaster)