Why was Ford's Alan Mulally successful?

NEW YORK, NY - DECEMBER 05: Alan Mulally, CEO of Ford, poses next to the 2015 Ford Mustang on the set of Good Morning America on December 5, 2013 in New York City. The 2015 model marks the 50th anniversary of the Ford Mustang line. (Photo by Andrew Burton/Getty Images)

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    Why was Ford's Alan Mulally successful?

CNN's Maggie Lake looks back at the tests outgoing CEO Alan Mulally has faced at Ford, and why he's scored so high.