SurveyUSA is sometimes volatile.
The race is very close in Virginia.
SUSA does not adjust for voter affiliation. Nothing wrong with that per se. it does mean their polls swing more widely than others, however.
McCain had a very rough week last week. It initially looked like the bad economic news might knock him out permanently. He regained his footing, however, and ended the week pretty strong.
I still feel good about our chances in Virginia, but the race is no doubt extremely close their right now.