O'Mara on taking case: 'It's what I do'

SANFORD, FL - JULY 10:  Defense attorney Mark O'Mara speaks with assistant state attorney Bernie de la Rionda during George Zimmerman's murder trial in Semimole circuit court July 10, 2013 in Sanford, Florida. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin. (Photo by Gary W. Green-Pool/Getty Images)

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    O'Mara on taking case: 'It's what I do'

CNN's Martin Savidge sits down with George Zimmerman's attorney Mark O'Mara to discuss the Trayvon Martin case.