From the New York Times:
'Turnout on Saturday was estimated at a record 530,000 people, nearly 100,000 more than in the Republican primary a week ago. More than half of the Democratic voters were African-American, and surveys of voters leaving the polls suggested that their heavy turnout helped propel Mr. Obama to victory.
Mr. Obama, who built an extensive grass-roots network across the state over the last year, received the support of about 80 percent of black voters, the exit polls showed. He also received about one-quarter of the white vote, with Mrs. Clinton and Mr. Edwards splitting the remainder.
In particular, Mr. Obama was helped by strong support from black women, who made up 35 percent of the voters. Mrs. Clinton, with the help of her husband, had competed vigorously for black women voters, but Mr. Obama received about 80 percent of their support, according to the exit polls, conducted by Edison/Mitofsky for the National Election Pool of television networks and The Associated Press.'
'White voters under the age of 40 divided their support, with almost 40 percent for Mr. Obama, and about 3 in 10 each for Mr. Edwards and Mrs. Clinton. Almost 80 percent of blacks under the age of 40 voted for Mr. Obama.
Mrs. Clinton and Mr. Edwards divided white voters age 40 and older equally, with about 40 percent each, according to exit polls. Among older blacks, 80 percent supported Mr. Obama.
The South Carolina primary was the first contest of the year in which race rose to the forefront. While Mr. Obama seldom directly mentioned the historic nature of his candidacy, it was not lost on the thousands of voters who turned out to see him in all regions of the state.'