A demonstrator blocks a commuter train as they protest the acquittal of George Zimmerman in the Trayvon Martin trial, in Los Angeles, California July 14, 2013. U.S. President Barack Obama called for ... more 
A demonstrator blocks a commuter train as they protest the acquittal of George Zimmerman in the Trayvon Martin trial, in Los Angeles, California July 14, 2013. U.S. President Barack Obama called for calm the Sunday after the acquittal of George Zimmerman in the shooting death of unarmed black teenager Trayvon Martin, as thousands of civil rights demonstrators turned out at rallies to condemn racial profiling.  (REUTERS/Jonathan Alcorn) less 
1 / 22
Reuters | Photo By REUTERS/Jonathan Alcorn
Tue, Feb 25, 2014 5:00 PM EST