Really? What is your idea of "close"? Suppose it were 2% and the polls showed Romney trailing by 3%? Imagine if there were a whole lot of people in PA just like you and ALL of them stayed home because the polls showed Romney trailing by 3 points? Suppose also that the number of people staying home is actually enough to make Romney the winner but instead he loses because some push poll paints a false picture of the candidates position in the race? Just suppose.
“Close” is whatever I think it is, and is subject to change when I want it to.