Obama decided Thursday to speak out on the Martin case . The president said he was "disappointed" in Martin's acquittal and called for a federal investigation into whether police officers are too quick to use deadly force against minorities. President Obama explains African American frustration over the Trayvon Martin killing . He says demonstrations over the verdict must remain non-violent .
Obama decided Thursday to speak out on the Martin case . Zimmerman 's defense team says the verdict was just . President Obama explains African American frustration over the Trayvon Martin killing . He says demonstrations over the verdict must remain non-violent .