In Syria, a top rebel leader says preparations for the "battle of Damascus" have begun. Speaking from his headquarters in northern Syria, the colonel, who defected seven months ago, says the rebels have had a number of battlefield successes over the past month from capturing key military bases in several parts of Syria. He says the rebels now have enough weapons that they've seized from government bases. Military analysts say the balance is tipping in the rebel's favor. Robert Siegel talks to Deborah Amos.