If a state is 6-8% in November, it's not even close to being a swing state. Today, however, a state could be 5-6% and reasonably become a swing state by November. If one looks at the aggregates today, Missouri and South Carolina are at 5% and 6% respectively (both with Trump leading), but individual polls have shown them within striking distance for Secretary Clinton. It wasn't long ago that Clinton was ahead in Missouri by +5 in one good poll, and the two most recent polls out of South Carolina show a tie.