** FILE ** in this Jan. 21, 2008 file photo, Sen. Barack Obama, D-Ill., left, and former North Carolina Sen. John Edwards chat while participating in a rally on the South Carolina Capitol steps in honor of Martin Luther King, in Columbia, S.C. Edwards has given his long-awaited endorsement to Barack Obama, it was announced Wednesday, May 14, 2008.
(Charles Rex Arbogast, Associated Press / May 14, 2008)
