Democratic presidential candidate and U.S. Senator Barack Obama (D-IL) (L) speaks during a campaign stop at the College of Charleston after receiving an endorsement from former presidential candidate and U.S. Senator John Kerry (D-MA) in Charleston, South Carolina, January 10, 2008. REUTERS/Joshua Lott
Democratic presidential hopeful Sen. Barack Obama, D-Ill., addresses the crowd at a rally on the College of Charleston campus in Charleston, S.C., as former Democratic presidential candidate, Sen. John Kerry, D-Mass., listens Thursday, Jan. 10, 2008. Kerry endorsed Obama at the rally. (AP Photo/Charles Rex Arbogast)
Democratic presidential candidate and U.S. Senator Barack Obama (D-IL) (L) receives an endorsement from former presidential candidate and U.S. Senator John Kerry (D-MA) (2nd L) as he speaks during a campaign stop at the College of Charleston in Charleston, South Carolina, January 10, 2008. REUTERS/Joshua Lott
Democratic presidential hopeful Sen. Barack Obama, D-Ill. left, works the crowd at a rally on the College of Charleston campus in Charleston, S.C., where former Democratic presidential candidate John Kerry endorsed Obama Thursday, Jan. 10, 2008. (AP Photo/Charles Rex Arbogast)
Democratic presidential candidate and U.S. Senator Barack Obama (D-IL) and former presidential candidate and U.S. Senator John Kerry (D-MA) (R) greet supporters after Obama received Kerry's endorsement during a campaign stop at the College of Charleston in Charleston, South Carolina, January 10, 2008. REUTERS/Joshua Lott