Doubts cast on Gallup poll

Democratic presidential candidate Senator Barack Obama campaigning last week in Detroit, Michigan. The latest opinion poll, putting his challenger John McCain ahead, has been doubted. Photo/REUTERS

What you need to know:

  • Gallup tracking poll is conducted by making phone calls to voters.
  • Political scientists have begun to doubt the accuracy of the polls.

The accuracy of opinion polls showing a slim lead by United States Republican candidate John McCain over Barack Obama has been put in doubt following the discovery that the pollsters did not take into account a recent surge in Democratic Party membership.

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