3 Nov 2008
Each graph shows the percentage difference between the number of supporters for Sen. Obama and the number of supporters for Sen. McCain. For example, a value of 10 means that 10 percent more people who were polled expressed a preference for Sen. Obama. Blue and red symbols indicate a lead of 7 percentage points or more for Sen. Obama or Sen. McCain, respectively.
The non-linear time scale shows an expanded view of the last 2 months of poll data, and a compressed view of the earlier data.
The poll data was provided by www.electoral-vote.com