(CNN) - Hillary Clinton's presidential campaign is expecting Massachusetts Sen. Ted Kennedy to endorse Barack Obama for president.
A Clinton campaign source tells CNN's Suzanne Malveaux the campaign was told "that Ted Kennedy is endorsing Obama and expecting it."
Meanwhile, a Massachusetts Democratic source close to the senator tells CNN's John King that Kennedy has indeed committed to endorse Obama.
The source said Kennedy has "enormous respect and admiration of Sen. Clinton" but "believes Sen. Obama has a unique message and a unique opportunity."
Kennedy's niece, Caroline Kennedy, endorsed Obama today in a New York Times op-ed entitled, "A President Like My Father."
UPDATE: Asked about reports of Kennedy's endorsement, Obama said Sunday, "I’ve had ongoing conversations with Ted since I’ve got into this race. At the point where he is clear about what he’s doing and what to make it public, I will let Ted make it public."