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Its easy to figure out. Watch this:
McCain's 40% = 28% Bushies + 12% of people who think Obama is a Muslim (ie secret terrorist)
That's where it comes from. It will never get lower and may get higher.
Obamas 46-47% = mixture of Democrats, progressives, some early attention indies and a spattering of republicans.
14-16% or so are still not yet paying attention. Many of them are independents. They are yet undecided.
This week was probably the first time they started paying attention. Almost being forced to by the non-stop Obama coverage. (This is why this trip and the imagery was brilliant. Obama is "different" so people need to see him looking like he could be president)
It won;t be really until AFTER the conventions (closer to the first debate) that those 14-16% will start paying close attention.
How do I know? I'm an independent who (heretofore) never really paid much attention until the debates.