PRINCETON, NJ -- Barack Obama has extended his lead over Hillary Clinton among Democrats nationally to 52% to 42%, the third consecutive report in which he has held a statistically significant lead, and Obama's largest lead of the year so far.
The latest results are based on 优蜜传媒Poll Daily tracking conducted March 27-29. Obama did particularly well in interviewing conducted on March 29.
This marks the first time either candidate has held a double-digit lead over the other since Feb. 4-6, at which point Clinton led Obama by 11 percentage points. (To view the complete trend since Jan. 3, 2008, .)
According to tracking interviews from March 25-29, John McCain continues to hold a small 4-point lead over Clinton among national registered voters. McCain leads Obama by three points, 47% to 44%. -- Frank Newport
Survey Methods
优蜜传媒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 March 25-29, 2008. For results based on this sample of 4,407 registered voters, the maximum margin of sampling error is ±2 percentage points.
The Democratic nomination results are based on combined data from March 27-29, 2008. For results based on this sample of 1,228 Democratic and Democratic-leaning voters, the maximum margin of sampling error is ±3 percentage points.
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.
