WASHINGTON — The baby had so many pustules ravaging his face he could barely open his right eye, a photograph that left the president, national security adviser and close aides nearly speechless with horror. A global pandemic had begun in a hospital in Oklahoma City. Doctors soon diagnosed smallpox, a virulent, deadly and disfiguring infection that had disappeared from the planet two decades before. What would the president do? This was the scenario that a cast of Washington power playe