PRINCETON, NJ -- Barack Obama has a 48% to 41% lead in the latest Gallup Poll Daily tracking presidential election trial heat, based on June 7-9 polling.

Voting preferences have been fairly stable over the last three individual days of tracking polling, all conducted since Hillary Clinton officially suspended her candidacy and publicly endorsed Obama for president on Saturday.

The seven percentage point advantage is Obama's largest to date since Gallup began tracking the general election in March. In turn, McCain has led Obama by as many as six percentage points in early May. (To view the complete trend since March 7, 2008, click here.) -- Jeff Jones

Survey Methods

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 June 7-9, 2008. For results based on this sample of 2,633 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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