At some point during tonight’s State of the Union, President Barack Obama will likely glance up and to the left of his podium, gesture toward the gallery, and mention one of the unknown Americans seated in the first lady’s box. This year their names include Edith Childs and Earl Smith, but insiders have a different name for them: “Skutniks,” in reference to the first everyday American invited by a president to embellish the State of the Union. Lenny Skutnik was a local hero, a Congressional Budget Office employee who plunged into the frigid Potomac after an Air Florida plane crash...