A suspicious cooler left near the Somerset County crash site of Flight 93 Sunday night has sent state police and federal investigators into a spin.What made the cooler questionable, police said, were the several containers inside labeled "Three Mile Island," as well as a radiation detection card that had apparently been stolen from the nuclear power plant's visitors' center.Whether it is a bad practical joke or something sinister, officials don't know yet.But with the president's visit just days away, police are not taking any chances, and certainly are not taking the incident lightly.As of late this morning, state police, along...