Sen. Chris Murphy of Connecticut confirmed to CNN on Thursday morning that raising the federal age to purchase AR-15 style semiautomatic rifles to 21 is off the table in Senate gun-control talks. Murphy, the Democrat leading the negotiations in conjunction with Republican Sen. John Cornyn of Texas, framed the shift as one of the compromises that will be needed to get at least 10 Republican votes, given the obstacle of the filibuster. The compromise, Murphy explained, would be adding "additional scrutiny" to 18 to 21-year-olds looking to buy a weapon such like the AR-15, though he stopped short at specifying...