Politics

Gallup Daily: Obama 48%, McCain 40%

No further gains for Obama in latest update

PRINCETON, NJ -- Barack Obama's lead over John McCain has settled back slightly to a 48% to 40% margin among registered voters in Gallup Poll Daily tracking conducted July 25-27.

Obama gained ground over McCain in each of the last three tracking updates, but today's average shows no further gains and a slight drop of Obama's percent of the vote from 49% to 48%. Obama's progress was coincident with his highly visible foreign tour, and it is not unreasonable to expect that his lead over McCain may settle back to a margin closer to what Gallup has measured for most of the summer as the impact of the trip fades. At the same time, McCain and his surrogates have engaged in sharp attacks on Obama in their attempt to blunt the impact of his trip, and some of that effort could have an effect on voters. The basic structure of the race so far this summer has been remarkably stable, and it remains to be seen if either candidate can alter it for a sustained period of time before the conventions in late August and early September. (To view the complete trend since March 7, 2008, click here.) -- Frank Newport

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 July 25-27, 2008. For results based on this sample of 2,674 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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