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NEW YORK, NY - MARCH 21: Supporters of Trayvon Martin rally in Union Square during a 'Million Hoodie March' in Manhattan on March 21, 2012 in New York City. Thousands of protesters turned out to demonstrate against the killing of the black unarmed teenager by a white neighborhood watch captain. The protesters marched through the streets after holding a large rally in Union Square. (Photo by Mario Tama/Getty Images)
NEW YORK, NY - MARCH 21: Supporters of Trayvon Martin rally in Union Square during a 'Million Hoodie March' in Manhattan on March 21, 2012 in New York City. Thousands of protesters turned out to demonstrate against the killing of the black unarmed teenager by a white neighborhood watch captain. The protesters marched through the streets after holding a large rally in Union Square. (Photo by Mario Tama/Getty Images)

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    Roland Martin: Enough is enough

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Roland Martin: Enough is enough

Roland Martin says the Trayvon Martin case should bring social change.

Roland Martin: Enough is enough

Roland Martin says the Trayvon Martin case should bring social change.