Every Friday, The Takeaway convenes a panel to look back at the week's big stories. This week we hear more about the arrest of Trayvon Martin shooter George Zimmerman, Rick Santorum's exit of the GOP presidential nomination race, Miami Marlins' Ozzie Guillen's foot-in-mouth disease, and more. This week we're joined by Mary Elizabeth Williams, staff writer for Salon,  journalist and blogger Farai Chideya,  and Ron Christie, Republican political strategist and political contributor for The Takeaway and It's a Free Country.