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FILE - This Dec. 3, 2012 file photo shows Senate Foreign Relations Chairman Sen. John Kerry, D-Mass., at a news conference on Capitol Hill in Washington. Kerry stands tall as President Barack Obama's good soldier. The lawmaker from Massachusetts has quietly jetted off to Afghanistan and Pakistan numerous times to tamp down diplomatic disputes that threatened to explode in the administration's face, spending hours on tea and walks with Afghan President Hamid Karzai or delicate negotiations in Islamabad. It's a highly unusual role for a Senate Foreign Relations Committee chairman: envoy without a specific portfolio. Kerry has pushed the White House's national security agenda in the Senate, with mixed results. He successfully ensured ratification of a nuclear arms reduction treaty in 2010 and most recently failed to convince Republicans to back a U.N. pact on the rights of persons with disabilities. (AP Photo/J. Scott Applewhite, File)

Secretary of State John Kerry

U.S. Secretary of State John Kerry embarked on talks March 25 with Afghan

President Hamid Karzai.