NEW: California Gov. Gavin Newsom moves to spare all 548 inmates on the state's death row from execution in a historic mass commutation. In an open letter to C

NEW: California Gov. Gavin Newsom moves to spare all 548 inmates on the state's death row from execution in a historic mass commutation. In an open letter to Californians, Newsom announces plans to replace every death sentence with life in prison without the possibility of parole, arguing that the …