This is a bit concerning but gives good detail in the writer's logic.

[whatthehey]

2. Not too worrying

Tied for Obama's fourth closest win in 2012? Sure but a) he won by over 5 points b) he didn't win all swing states so it is pretty far down the lost of swingers he did win c) Job numbers, including in PA, have improved greatly since then benefitting Dems, d) PA hasn't actually swung in a generation, going D six consecutive times e) The black and Latino ratios of the population have both increased by 10-20% (of the original ratio, not by 10-20 pts). Both are reliably blue and even more so likely with Trump. I'm pretty sure serious internal polling goes into all close states and showed the campaign staff (the folks Trump either doesn't have or doesn't listen to, remember) that money is better spent elsewhere.

I've never lived in PA but I was close to the border of it for a few years and traveled extensively in the state. The vast swathes of it that are redder than Dixie in the North and West can give visitors a depressing view of the state until you realize just how much more densely populated, and how blue, the two big cities are.