Doctors treating wounded House Majority Whip Rep. Steve Scalise have upgraded his condition from "critical" to "serious."Scalise and three others were shot Wednesday morning at a baseball practice in Alexandria, Va.The 51-year-old Republican congressman from Louisiana underwent another surgery on Saturday, the hospital treating him said, which was at least his third operation since being transported to the facility.Scalise "continues to show signs of improvement," MedStar Washington Hospital Center said in a statement Saturday evening."He is more responsive, and is speaking with his loved ones. The Scalise family greatly appreciates the outpouring of thoughts and prayers," the hospital wrote, "on behalf of the Scalise family."The American Hospital Association defines "critical" condition as: "Vital signs are unstable and not within normal limits. Patient may be unconscious. Indicators are unfavorable."And defines "serious" as: "Vital signs may be unstable and not within normal limits. Patient is acutely ill. Indicators are questionable."On Friday, the hospital's director of trauma, Dr. Jack Sava, called Scalise's injury a "transpelvic gunshot wound" which had "fragmented, and caused significant damage to bones, internal organs and blood vessels."He continued: