Question:
Democrat Barack Obama leads Hillary Clinton 35 percent to 26 percent among likely voters in North Carolina's May 6 Democratic primary. But nearly four in 10 are still undecided.

Poll Demographics

About this Poll
The North Carolina Primary Poll was conducted for The Charlotte Observer, The (Raleigh) News & Observer, WCNC-TV and WNCN-TV.

The poll is based on 803 telephone interviews conducted March 29 to April 1 by Braun Research of Princeton, N.J. Respondents said they were registered voters and intended to vote in the N.C. primary. 403 respondents said they would vote in the Republican primary and 400 in the Democratic primary.

Polltakers used random digit dialing, which provides each household in a telephone exchange an equal chance of being selected. Data are weighted to reflect N.C. voter registration.

The maximum sampling error for 803 interviews is plus or minus 3.5 percentage points at a 95% confidence level. This means the results in 19 of 20 similar samples would vary no more than 3.5 percentage points from the results obtained if every N.C. primary voter were surveyed. The sampling error for Democratic and Republican primary voters is 4.9 percentage points.

The practical difficulties of conducting public opinion surveys may introduce other sources of error that cannot be measured, such as individuals who refused to be interviewed, households not included because they do not have land-lines and respondents who give "socially desirable" answers.