Depends what you mean by "fight." Since I enjoy making accurate predictions, I wouldn't have been like "OMGZ McGOVERN MOMENTUM" on October 31, 1972.
Lets see a daily tracker from that day? Their certainly is tightening in the polls at this point. Remember, Truman was down by five eight days out and won by five.
Sure, there has been tightening nationally...but even you have to recognize that a McCain win without PA seems impossible at this point...
So for me, his chance of winning the election comes down to that. And that chance isn't all that good, but it's definitely possible.