Click here for Gallup's special roundup of July's important election polls.
PRINCETON, NJ -- Republican John McCain and Democrat Barack Obama are once again tied in the latest Gallup Poll Daily tracking presidential trial heat.
The results, based on a three-day rolling average of interviews conducted July 30-Aug. 1, show Obama and McCain each receiving 44% of the vote among registered voters. The candidates were also tied in Friday's update. Obama received a brief increase in support near the conclusion of his overseas trip last week, gaining a nine percentage point advantage in July 24-26 polling. But that bounce disappeared almost quickly as it emerged.
More broadly, Obama has enjoyed an average 3-point advantage since clinching the Democratic nomination in early June. For the moment, McCain has erased that small advantage. (To view the complete trend since March 7, 2008, click here.) -- Jeff Jones
For the Gallup Poll Daily tracking survey, Gallup is interviewing no fewer than 1,000 U.S. adults nationwide each day during 2008.
The general-election results are based on combined data from July 30-Aug. 1, 2008. For results based on this sample of 2,692 registered voters, the maximum margin of sampling error is ±2 percentage points.
Interviews are conducted with respondents on land-line telephones (for respondents with a land-line telephone) and cellular phones (for respondents who are cell-phone only).
In addition to sampling error, question wording and practical difficulties in conducting surveys can introduce error or bias into the findings of public opinion polls.
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