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The "Undecided" vote is exceedingly large for this late in an election cycle, and most of these individuals are "Independent" or unenrolled voters, depending on locale. The likelihood of them breaking late toward a transformational candidate like Obama is exceedingly slim, at least by historical standards. Instead, it is far more likely that these voters will select a more secure and known quantity, in this case: John McCain.

I suspect there is another factor at work here; more subtle, but perhaps decisive. Democrats, especially Hillary Clinton supporters are lying to pollsters in significant numbers, in order to avoid confrontation. This effect may be most pronounced in states like Ohio and Pennsylvania, where such votes are under enormous pressure from their Union bosses to vote for Obama. These voters might say only what they need to say to "get along", but intend to do something very different within the privacy of the voting booth.