Critical counties: Watch Allegheny County, PA, in this election
Updated 4:04 PM ET, Mon September 26, 2016
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Washington (CNN)Pittsburgh was a treasure of the industrial age, and as the times have changed, so has it. This blue pocket of the post-industrial United States sits in Allegheny County, a hub of urban and suburban life in western Pennsylvania. Far from the liberal hub of Philadelphia in the east, this county is the heart of battleground Pennsylvania.