P.M. Headlines

(Reuters): "NRA calls for armed school guards as US mourns massacre"

(CBS News): "No cliff deal under the Christmas tree"

(Reuters): "Wall Street falls on fiscal cliff setback"

(Politico): "Behind the scenes of the GOP meltdown"

(BBC News): "John Kerry: From good soldier to secretary of state"

(Daily Beast): "Hagel's mea culpa on gay rights"