developing now, you're looking at live pictures of air force one. it's getting ready to take off on a post debate swing state. he's heading first to iowa and then later in the day to ohio which, of course, brings us to less than 500 hours and only one debate left before the election. how about that? 500 hours. president obama heads to the midwest to campaign in two battleground states today, ohio and iowa. obama has 237 electoral votes, romney at 191. let's take a look at the critical states of flo-va. we saw romney narrowing the president's lead to six in ohio, pulling ahead of the president in virginia, basically pulling even, if you will, in the