No reason why Romney can't possibly win Maine and New Mexico and even Washington State and/or New Jersey (Remember his big supporter Christie pulled an upset in NJ three years ago when Obama came into the state to back Corzine enthusiastically.)
Sure there are other states he could win if he wins big but I’m can’t be that optimistic. NM polling doesn’t look good (and Johnson could be a harmful factor). Getting those last few % points in NJ is like pulling teeth. Though I don’t think Cristie was an upset, I remember expecting him to win.
MN and OR are also in that group of next most likely states.
I’d be thrilled with that 338 which would be sufficient to embarrass Obama and I’d be perfectly satisfied with the bare 270.