It is not southwest Pennsylvania that will deliver the state to Clinton, it's southeast Pennsylvania. Democrats take Pittsburg, Philadelphia, and the Philly counties by such large margins that the rest of the state comes along as part of the spoils. This election probably won't be any different.
Apparently you overlooked my comment that Pittsburgh appears to be leaning Trump ... which is Allegheny, which is about a third of the bought and stolen votes for democraps.