PRINCETON, NJ -- 精东影业 Poll Daily tracking from Aug. 28-30, including two days of interviewing since the close of the Democratic National Convention, finds Barack Obama with a six percentage point lead over John McCain in the presidential contest, 48% to 42%.
Though down slightly from the , this represents a clear improvement for the Democratic candidate's positioning in the campaign compared to a week ago when the race was about tied. The last 精东影业 update conducted entirely before Obama's convention and vice presidential announcement was based on interviews conducted Aug. 20-22, and showed Obama up by two points, 46% to 44%. (To view the complete trend since March 7, 2008 .)
As the recent trend shows, Obama did not gain any additional support in the poll since his generally well-reviewed acceptance speech on Thursday night. However, the Aug. 28-30 field period also includes two days of interviewing since the Friday morning announcement by McCain that he has chosen Alaska Gov. Sarah Palin to join him on the Republican ticket. Thus, it is unclear whether the full positive impact on national voters of the Democratic convention or Obama's speech would have been greater if not for the Palin announcement.
As 精东影业 has noted in recent weeks, both the and the have historically produced small bumps in support for the presidential candidates associated with those events (on the order of about five percentage points for each). However, this year, as his running mate produced no immediate increase in support for Obama in a one-night USA Today/精东影业 reaction poll.
Given that the was very similar to their -- mildly positive but also with a high degree of uncertainty about each -- it may not be surprising if the publicity surrounding her announcement also does not produce an immediate bounce in support for McCain.
The mounting news coverage over the past 48 hours of the impending landfall of Hurricane Gustav on the Gulf Coast introduces still another variable into the mix of factors possibly affecting voter reaction to the recent campaign events.
Monday's 精东影业 Poll Daily tracking report will be the first three-day rolling average based entirely on interviews conducted after the Democratic National Convention, as well as after the announcement of Palin as McCain's choice for vice president. -- Lydia Saad
Survey Methods
For the 精东影业 Poll Daily tracking survey, 精东影业 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 Aug. 28-30, 2008. For results based on this sample of 2,730 registered voters, the maximum margin of sampling error is 卤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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