several days, even weeks. >> trace: one of the big concern is that assad, if eventually ousted, that al qaeda linked extremists may take control of the but apparent live there's new research suggest those extremist might not be so strong? >> i had a fascinating conversation today with dr. elizabeth o'bagy. she has spent a lot of time on the ground in syria, and she and her team drew up a map, which they say shows the strength and the battlelines in syria. the lighter green areas are held by the rebels. the moderates, the darker green, where the extremists are, and the doctors says they're not as strong as has been made out by some on all sides of the political debate here, and the moderates can very easily be strengthened. listen. >> if there's enough done to empower and support those