He can't pull out of Ohio because he has no other viable route to victory. I realize it may be technically possible for him to get to 269 EV without winning Ohio, but the real problem is that if he can't win Ohio, it's unlikely he'll be able to win Wisconsin, Iowa, Colorado, or Virginia, and he needs to win at least two of them if he loses Ohio.
Below is BY FAR Romney's best shot..
That leaves VERY little room for error for Romney. By my counts your map is 273-265 Romney. He loses ANY more of the swing states and he will have just wasted 8 years of campaigning!
