How do you know this? even if true, that means that yesterday's number is not as good for McCain as the number that rolled off (Monday).
By my calculations, McCain narrowly won Monday in Rasmussen's poll. Right now it seems obvious that Rasmussen's numbers are out of whack because he had one of those 5% nights on Tuesday where one of the candidates polled over three standard deviations outside of the mean (wonky statistics lingo which in plain English translates into "outlier", which can happen roughly 5% of the time).
Rasmussen breaks down the day to day numbers for premium members.
The Rasmussen poll trended to Obama for two reasons.
1st: 1 +5 McCain sample rolled off.
2nd: A Huge +11 Obama sample on Tuesday.
That big Obama sample rolls off tomorrow. The poll should track toward McCain baring another huge Obama sample tonight.