The most important thing you need to know about the race at this point, from Karl Rove writing in the WSJ:
Almost everything we think we know right now will be revised and even overturned during the next six months. This has been a race in which conventional wisdom has often been proven wrong. The improbable or thought-to-be impossible has happened with regularity. It has created a boom market for punditry and opinion offering, and one of the grandest possible spectacles for political junkies in decades. Hold on to your hat. It's going to be one heck of a ride through Nov. 4.
That is, the most important thing you need to know right now is that you don’t know what you think you know.
Well, unless that itself is overturned.
You never know, if you know what I mean.