"One prominent superdelegate who is also the highest-ranking black in Congress told ABC News that the racially tinged way in which critics say the Clintons conducted their campaign in South Carolina is driving black superdelegates into the arms of Sen. Barack Obama, D-Ill..

"The surge - if I may use that word - occurred in direct correlation to the way that campaign had been ratcheted up," said Rep. Jim Clyburn, D-S.C., the House Majority Whip who has not endorsed a candidate. "Those of us who live in the South especially, we know the code words when we hear them and we understand the tone. People felt some of that was going on and they reacted to it in a very bitter way."

Clyburn made his remarks as his colleague, Rep. John Lewis, D-Ga., switched from supporting Clinton to announcing that as a superdelegate he will vote for Obama.

"In recent days, there is a sense of movement and a sense of spirit," Lewis told The New York Times. "Something is happening in America and people are prepared and ready to make that great leap."

Lewis also said he was influenced by the fact that his home state voted heavily for Obama. Clyburn told ABC News that he had heard from many black lawmakers who thought the Clintons played the race card. Clyburn said of particular offense was former President Clinton's comparison of Obama with the Rev. Jesse Jackson. [...]