Only if he wins NC, VA, IA, CO, NV, FL and Wisconsin, and maybe NH. So it's possible but it's like drawing an inside straight in poker.
Actually, given the current toss up states, Romney could get to 270 despite losing Ohio, Florida and Virginia. To do so requires that he win North Carolina, New Hampshire, Michigan, Wisconsin, Colorado and either Nevada or Iowa.
Now I doubt if Romney wins those states he would lose Florida, Ohio and Virginia, but the arithmetic is what it is. Of those state I would guess Pennsylvania is the longest shot for Romney.