At this point, Romney just has to assume that North Carolina, Florida, and Virginia will fall to him, because those states alone won't get him to 270. Barring a miracle, it also appears that Ohio is going to stick with the President, so his best option left is probably throwing a bunch of time and money at a few states that are leaning Obama, but states where he doesn't have the strong organization like he does in Ohio. Romney probably made a mistake by leaving Pennsylvania earlier this fall, but then again, how was he supposed to know Ohio was going to be so stubborn?
Could this be the map Romney is going for?