Syrian rebels close in on crucial city of Homs

Thousands of people have been forced to leave parts of central Syria as rebel forces advance on the country's third-largest city of Homs. It would be a major win for the rebels, who have also captured the city of Aleppo. CBS News national security contributor Sam Vinograd joins with analysis.

Syrian rebels close in on crucial city of Homs
Thousands of people have been forced to leave parts of central Syria as rebel forces advance on the country's third-largest city of Homs. It would be a major win for the rebels, who have also captured the city of Aleppo. CBS News national security contributor Sam Vinograd joins with analysis.