South Carolina Zogby poll: Obama 43%, Clinton 25%, Edwards 15% (MOE 3.4%)

Clinton and Edwards are virtually tied among white voters, with Clinton leading 33 percent to 32 percent, while Obama is third among whites at 18 percent. Likely black voters make up slightly more than half of the poll sample.

"Obama is doing very well among African-Americans but getting a decent share of the white vote in a three-way race," pollster John Zogby said.


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The majority of the polling in the three-day survey was done before Monday night's angry debate in Myrtle Beach, where Obama and Clinton traded harsh accusations about their records and Edwards chastised the pair for their squabbling.

In the one night of polling conducted after the debate, Edwards, a former North Carolina senator who won the South Carolina primary during his failed presidential bid in 2000, appeared to have made some slight gains, Zogby said.

"The question is, who does Edwards help and hurt? What impact does he have?" Zogby said.

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Obama led consistently among almost all sub-groups, including men, women, liberals, conservatives, young voters, low-income voters, high-income voters and union households.

Clinton edged Obama out among the oldest voters, above age 70, usually her greatest strength. Edwards led Obama among Republicans.