FILE - In this Nov. 13, 2012 file photo, Sen. Scott Brown, R-Mass., speaks during a media availability, on Capitol Hill in Washington. Brown, who was defeated in his re-election bid, said Friday, Feb. 1, 2013 that he will not run for the Senate seat vacated by John Kerry, who was named secretary of state. (AP Photo/Alex Brandon, File)
Retiring Rep. Barney Frank, D-Mass. talks on Capitol Hill in Washington, Thursday, Jan. 3, 2013, prior to the start of the 113th Congress. Joseph Kennedy III is scheduled to be sworn in Thursday, replacing Frank. (AP Photo/Cliff Owen)
U.S. Secretary of State John Kerry, left, shakes hands after a news conference with French Minister of Foreign Affairs Laurent Fabius at the Foreign Ministry in Paris on Wednesday, Feb. 27, 2013. Paris is the third leg of Kerry's first official overseas trip, a hectic nine-day dash through Europe and the Middle East. (AP Photo/Jacquelyn Martin, Pool)
U.S. Secretary of State John Kerry embraces his long time friend, U.S. Ambassador to Italy David Thorne, left, as Kerry arrives at Ciampino Airport, in Rome on Wednesday, Feb. 27, 2013. where talks on Syria will be held. Rome is the fourth leg of Kerry's first official overseas trip, a hectic nine-day dash through Europe and the Middle East. (AP Photo/Jacquelyn Martin, Pool)
BAGHDAD (AP) — US Secretary of State John Kerry lands in Baghdad for unannounced visit.