Obama campaign manager David Plouffe has long touted the Democrats' ace in the hole: the greater energy and engagement of his side's voters than that of the demoralized Republicans.
His five pollsters have backed him up all year on that view.
But things might be changing before our national eyes.
There is nothing in politics more important than emotion.
HALPERIN'S TAKE: The 18 ways Sarah Palin can help McCain close the enthusiasm gap.
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