With the race where it is now, these periodic Romney leads in Rasmussen polls are plausible, if not likely. But what happens in October of Obama moves to a bigger national lead? Will Ras follow along, or ratchet down his LV model again (with even more whites and olds) to keep putting out periodic "good news" polls for his customers.
If history is any guide, his numbers will begin to conform to the aggregate sometime in October.
That's true and if he did push the model too far his final realignment to closer reality could end up looking like a huge Obama surge (that only he is seeing)