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But uncertainty about the makeup of the new electorate, and whether that high turnout could shatter historic voting patterns or simply reinforce them, casts doubt over opinion polls showing Obama with a solid lead on McCain.
"The question of who turns out to vote is the key to who becomes the next president," said Steven Schier, a political analyst at Carleton College in Minnesota.
Obama is hoping a big boost among new and sporadic voters, particularly blacks and the young, will propel him beyond the total of 56 million ballots for Democrat John Kerry in 2004.
But McCain campaign officials said there is no evidence a higher turnout will fundamentally change the makeup of the electorate -- or, they hope, the outcome on Tuesday.
...
But he said turnout appeared to be higher in all demographic groups, potentially wiping out any advantages Obama gains from an increase in black and young voters.

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