Sen. John Kerry, D-Mass., U.N. Ambassador Susan Rice, and Secretary of State Hillary Clinton listen to President Obama speak at the State Department in May 2011. With Rice withdrawing her name from consideration to succeed Clinton, speculation has turned to Kerry. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

Libyan rebels on the outskirts of the oil town of Ras Lanuf flash the victory sign at a Libyan airforce fighter jet flying overhead after dropping a bomb on Monday. Marco Longari/AFP/Getty Images hide caption

itoggle caption Marco Longari/AFP/Getty Images