David Duvall Orr
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David Duvall Orr (born: October 4, 1944) served as interim mayor of Chicago, Illinois from November 25 to December 2, 1987 for the Democratic Party following the death of Harold Washington. Orr is a graduate of Simpson College in Indianola, Iowa.
As of 2005, he is the Cook County Clerk, responsible for the third largest election district in the United States.