Secretary of State Hillary Clinton was hospitalized Sunday after doctors discovered a blood clot during a follow-up exam related to a concussion she suffered this month, her spokesman said. She is expected to remain at New York Presbyterian Hospital for the next 48 hours so doctors can monitor her condition and treat her with anticoagulants, said Philippe Reines, deputy assistant secretary of state. "Her doctors will continue to assess her condition, including other issues associated with her concussion," Reines said. "They will determine if any further action is required." Reines did not specify where the clot was discovered