Kelly McEvers, foreign correspondent, NPR
Rami Khouri, director of the Issam Fares Institute for Public Policy and International Affairs at the American University of Beirut
Andrew Tabler, author, In the Lion's Den: An Eyewitness Account of Washington's Battle with Syria
The leader of the Lebanese militant group Hezbollah made a public commitment to support Syria's president in a fight to the end. Hezbollah's involvement raises serious questions about the future of Syrian rebels, and whether the civil war could spill into other countries in the Middle East.