Its really not - almost all polls, including the "battle ground" states are within the margin of error.
In fact, the funny part on a lot of these graphs people post appear to be huge changes are literally 1-2% points. Would I prefer to be Obama on these polls that have him up 1 to 2% ? Absolutely, but IMO with all the variables out there I wouldn't bet say, $5000 on the outcome on a 1-2% difference. Other people seem to be pretty comfortable with it though.
In the case of OH, it's not just MOE. There are few if ANY polls recently giving Romney anything better than a tie. Also, state polls typically have a smaller MOE than national polls due to sample size. With early voting going on since the 2nd, that doesn't look good for Mitt at all...