Demonstrators assume the "hand's up don't shoot" position as others protesting the deaths of two unarmed black men at the hands of white police officers in New York City and Ferguson, Mo. lay in the street during a march through Pittsburgh on Thursday, Dec. 4, 2014. (AP Photo/Keith Srakocic)

Police cases converge to stir national debate

A day after protests erupted in New York over the decision not to charge a white officer in the death of a black man, civil rights leaders p…