Obama used the wrong metaphor, it should have been the "Flock of Crazy", herded from the top down, e.g., FOX News, Hanity, O'Reilly, Breibart, etc, etc.
President Obama Says Trump Came From Years of a GOP 'Swamp of Crazy'
http://abcnews.go.com/Politics/president-obama-trump-gop-feeding-base-kinds-crazy/story?id=42760197
President Obama Says Trump Came From Years of a GOP 'Swamp of Crazy'
- By Jordyn Phelps
http://abcnews.go.com/Politics/president-obama-trump-gop-feeding-base-kinds-crazy/story?id=42760197