Here's a similar map of Nevada from 2012:
Obama got 56% of the vote in one county and less than 51% in another county. He lost all the rest, most of them by margins of more than 18 points.
He won the state by more than six points overall.
Worth looking at this:
https://en.wikipedia.org/wiki/Political_party_strength_in_U.S._states
It tells you how steep the hill is in various states. By party registration.
Frankly, Colorado/New Hampshire is the best counter to losing PA.