The ambition of the Senate’s response to massacres in Uvalde, Texas, and Buffalo, New York, is ebbing by the day even as harrowing new details emerge of the horror of the victims’ last moments and the agony of those left behind.The ambition of the Senate’s response to massacres in Uvalde, Texas, and Buffalo, New York, is ebbing by the day even as harrowing new details emerge of the horror of the victims’ last moments and the agony of those left behind.