by David Paul Kuhn
... In the past eight presidential contests, voters who made up their minds during the last week of the campaign never went for either ticket by large margins of 3-2 or 2-1, which potentially could tip the scales.
"There is likely no hidden life raft in the undecided vote for John McCain," said Andy Kohut, director of the Pew Research Center.
Pew recently conducted an internal analysis of its polls and concluded that undecided voters were likely to split about equally between McCain and Obama on Election Day, meaning the group is more evenly split between the two candidates than the electorate overall, Kohut said. In the coming days, Pew, like the Gallup poll, will finalize its best estimate for how undecided voters will cast their ballots.
Since 1976, when exit polls first asked voters when they made up their minds, about 10 percent to 25 percent of voters consistently told pollsters that they didn't decide until the final week of the campaign ...
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