Pittsburgh isn't "liberal." Most Pittsburghers are quite conservative.
But they are Democrats. They still believe that "Democrats are for the workin' man, Republicans are for the rich." And they mindlessly vote that way.
It's wrong, dead wrong, but you can't change them.
If you remember RIGHT Dan Rooney endorsed 0bama from the get go. I am still a Steelers fan but he LEFT a terrible taste in my mouth when he did that.