(CNN) - Former 2004 presidential hopeful Sen. John Kerry will endorse Sen. Barack Obama for the Democratic presidential nomination, two sources told CNN Thursday.
The announcement will come at 2 p.m. in Charleston, S.C., the sources said.
"(Kerry) remains one of the most popular figures in the Democratic Party and (has) an e-mail list with millions of addresses," an Obama source said.
Kerry ran in 2004 on the Democratic ticket with former Sen. John Edwards, who is running this year for party's presidential nomination.
Edwards reacted Thursday to his former running mate's decision in a brief statement that hinted at the split between the two men following the last presidential election. “Our country and our party are stronger because of John’s service, and I respect his decision. When we were running against each other and on the same ticket, John and I agreed on many issues," he said in a statement.
"I continue to believe that this election is about the future, not the past, and that the country needs a President who will fight aggressively to end the status quo and change the Washington system and to give voice to all of those whose voices are ignored in the corridors of power.”