Read the full InsiderAdvantage poll

An InsiderAdvantage/Majority Opinion survey conducted for the Southern Political Report and released this weekend shows Sen. Barack Obama with a slight lead over Sen. Hillary Clinton in the South Carolina Democratic presidential primary. The survey of 430 likely voters shows Obama with 26 percent of the vote and Clinton with 24 percent. They were followed by John Edwards at 15 percent, Joseph Biden at 10 percent and all others in single digits. 22 percent expressed no opinion. The pollsters attributed Obama’s gain to Oprah Winfrey’s visit to the state on his behalf as word spread through the black community. The poll surveyed 430 Democratic likely voters, for a margin of error of plus or minus 5 percent..