I've said this earlier: Pennsylvania should be alarming to the Democrats.
About 2/3 of the state is in the Appalachians and Democrats have utterly collapsed in the Appalachians.
Romney should have been organizing in the state for the entire year was as in Michigan, Minnesota and Oregon and he should have gone hard and heavy in all four after that first debate win.
None of those three states have much potential for Republican (unlike Pennsylvania).
I have heard a lot of people said that the GOP should be competitive in Minnesota because the state is very white. This is nonsense. Republicans perform very well with Southern whites, but Minnesota doesn't have a lot of Southern white. The same can be observed in Maine. It is the whitest state in the nation, yet it overwhelmingly votes for Obama and other Democrats.
Oregon isn't really competitive without a third party peeling away Democratic votes. Portland will continue power the state to Democratic wins. Even without Portland, the state will be about even.
Michigan - don't even go there. It would be one of the last Midwestern state to go Republican had Romney overwhelmingly won the Midwest (which he didn't).
Romney did win the White Vote in MN 49-48% but in the Twin Cities is where the R's get destroyed.
Michigan actually has a 1 point lower Dem PVI than Oregon(D+4 to D+5.)