Plot: 2013/01/31 Headlines: Gabrielle Giffords Makes Surprise Senate Appearance to Back Control; NRA Chief LaPierre, Durbin Spar on Background Checks; 1 Killed, 2 Wounded in Phoenix Shooting; Teen Who Performed at Obama Inauguration Shot Dead in Chicago; Obama Predicts Passage of Gun Control, Immigration Reform; Israeli Warplanes Bomb Syria, Killing 2; Syrian Opposition Figure Offers Dialogue; Dutch Court Rules Shell Partially Liable for Nigeria Oil Spills; Rare January Tornadoes Kill 2 in Southern U. S