Historically , when a Democrat carries Pennsylvania , the entire lower - left corner of the state from Pittsburgh to Johnstown is coated blue .
However , Southwestern Pennsylvania , until recently , was the most Democratic region of the state ( except for Philadelphia ) .
Historically , when a Democratic carries Pennsylvania , the entire lower - left corner of the state from Pittsburgh to Johnstown is coated blue .
However , Southwestern Pennsylvania , until recently , was the most Democratic region of the state ( except for Philadelphia ) .