In the sphere of FR that’s likely 50% not 9%. But a 9% undecided rate in the general body of voters is not that unusual in a contest like this where the heaviest cannon have yet to shoot. And it’s also not unusual for it to split heavily in favor of the challenger as the decision comes down to the wire. Like impending death, the election has a way of focusing the mind.
Of course, out in the real world outside of FR the driving force may be the old sayings “Are you better off than you were four years ago?” and “It’s the economy stupid.” If so, it’s a landslide for Romney-Ryan.