ISIS in Obama's own words: from a joke to war in 9 months

The threat of ISIS grew rapidly this year, and nothing illustrates the story as clearly as the President's own evolving comments on the terrorist group.

There's also real fear among Americans too, who were aware of ISIS' murder of American journalists at staggering levels - 94% at last polling (compared to 79% that had heard about Syria's use of chemical weapons).

Produced by Joe Posner

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