It was one of the few regions in which Obama did worse than John Kerry .
In 2008 , however , the Republicans won every single county in Southwestern Pennsylvania except for Allegheny County , home to Pittsburgh ( which voted Democratic by 15 % ) .
Democratic was one of the few regions in which Obama did worse than John Kerry .
In 2008 , however , the Republicans won every single county in Southwestern Pennsylvania except for Allegheny County , home to Pittsburgh ( which voted Democratic by 15 % ) .