A town hall for liberal activists featuring two Democratic presidential candidates was interrupted by dozens of demonstrators on Saturday who shouted down the contenders and demanded they address criminal justice issues and police brutality... ..."Black lives matter! Black lives matter!" they shouted toward O'Malley, and began a call-and-repeat rallying cry that activists have been using in the wake of the death of 28-year-old Sandra Bland, who died in police custody last week. "If I die in police in custody!" one of the chants went, "Burn everything down! That's the only way mother******* like you listen!"