"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus
Rasmussen’s methodology provides a very good look at trends and responses to events.
Unfortunately, there was no change in Obama’s 4% lead last night.
That is a multiday moving average so we do not know if the oldest day was very strong for Obama, and last night strong for McCain yielding a net neutral result. But we do know it was net neutral.
Palin’s announcement probably did trample on any uptick that would have occurred from his speech, but we do not yet know if PUMA polling respondents moving to McCain were obscured by some strong Obama polling result on the oldest day of moving average.