Bill Clinton will be campaigning for his wife in South Carolina just a day before Obama has Oprah Winfrey there for a large event.
(CNN) - It will be the battle of the rock star surrogates this weekend, with a last minute trip by former President Bill Clinton scheduled for South Carolina as Oprah Winfrey campaigns with Democratic Presidential candidate Barack Obama.
Clinton's appearance for his wife Senator Hillary Clinton was a surprise, added amid saturation media coverage of Obama's three-state swing.
The former President told reporters at a stop in New York City Friday the trip was a "coincidence", though he'll be in South Carolina the day before Obama and Winfrey stop in Columbia.
During a day of appearances in Charleston, Clinton will speak on health care disparity, attend a forum on the subject, visit patients and families at a Children's Hospital and stop at a downtown Charleston market.
The dueling trips come as Hillary Clinton and Barack Obama compete for a bigger share of the critical African-American vote in South Carolina, where the former president remains a popular figure.
Hillary Clinton campaigns Saturday in Iowa, as Obama and Winfrey hold two rallies in Iowa.
–CNN Political Desk Managing Editor Steve Brusk