Ronan Farrow Daily 01/15/15

How ISIS became so dangerous, so quickly

Fierce US-led airstrikes haven’t stopped ISIS from reportedly seizing almost a third of Syria. With Vocativ, we look back at how this militant force has mobilized and talk to MSNBC's Mikey Kay about his one-on-one with the radical cleric Omar Bakri. ... more Duration: {{video.duration.momentjs}}