COLUMBIA, South Carolina (Reuters) - Democrat Barack Obama holds a double-digit lead on rival Hillary Clinton three days before South Carolina's presidential primary, aided by a huge edge among black voters, according to a Reuters/C-SPAN/Zogby poll released on Wednesday.
Obama leads Clinton 43 percent to 25 percent in the rolling tracking poll, with John Edwards a distant third at 15 percent heading into Saturday's contest. The poll has a margin of error of 3.4 percentage points.
More than half of the Democratic primary voters in South Carolina are expected to be black. Obama, an Illinois senator who would be the first black U.S. president, leads among African-Americans by 65 percent to 16 percent.
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.