I don't know. The RCP average showed a 6 point swing in about 2 weeks. From the end of September to October 9th, Romney went from 44 to 48 and Obama went from 49 to 47.
If you looked at that swing, you could, unreasonably, assume a similar trend may continue. Additionally, the RCP average for electoral votes went from +126 for Obama to +16 for Obama in two weeks. Again, that's a signifiicant swing, and you could assume it is indicative of a trend that will continue,,
I hear you, it's not unreasonable. I just think "landslide" is a big stretch. Also, I have atrocious taste in outerwear.