reuters.com — Credit: Reuters/Joshua Roberts U.S. Senator John Kerry (D-MA), Chairman of the Senate Foreign Relations Committee, speaks to reporters about the attack on the U.S. consulate in Benghazi, on Capitol Hill in Washington December 19, 2012. Kerry, chairman of the Senate Foreign Relations Committee and the Democratic presidential candidate in 2004, had been widely tipped for the post as America's top diplomat after U.N.