It seems to me the most logical way to read Romney's latest actions are as an acknowledgement he expects to lose. Among the battleground states, he has multiple "must wins" including Florida and Ohio. He has spent the lion's share of this entire campaign there, and has invested especially heavily in the last few weeks. The only way it would ever make sense to move on from these areas to second tier opportunities is if the main battlegrounds were already decided, either for or against you. Quite clearly--especially in the case of Ohio--the polls don't at all support the idea that the state is a lock for Romney. So it seems more likely that he has decided it's out of reach, and is instead trying to divert to Pennsylvania to make up for it.