Analysis: Shocked Obama wants to target gun violence, but how?

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U.S. President Barack Obama prays during a vigil held at Newtown High School for families of victims of the Sandy Hook Elementary School shooting in Newtown, Connecticut December 16, 2012. Obama is visiting Newtown High School to meet with the families of the victims and to thank first responders to the school shooting here that was one of the deadliest such incidents in the nation's history. REUTERS/Kevin Lamarque