By Bob Brigham Police in the District of Columbia are searching for a man who allegedly repeatedly fired at a car transporting an infant in a suspected road rage incident. WUSA-TV reports the incident occurred Thursday morning on I-285 near Joint Base Anacostia Boling. Leon Vessels says he was transporting his 11-month-old son Legend with a friend, but was driving slower as he was driving on an emergency spare tire, often referred to as a “donut.” Vessels says a black Mitsubishi Mirage began tailgating him, telling the station, “that guy gets behind us, clearly, because I’m not driving fast en…