A spokesman for Democrat Barack Obama's presidential campaign says he's won the endorsements of two more superdelegates.

Obama spokesman Dan Pfeiffer says Oregon Congressman Peter DeFazio plans to endorse the Illinois senator at an event in Oregon, which holds it's primary May 20th.

Pfeiffer also says New Jersey Congressman Don Payne is switching his support to Obama. He had been backing Hillary Clinton.

The movement of uncommitted superdelegates into Obama's campaign has picked up sharply since Tuesday, when he soundly defeated Clinton in North Carolina's primary and held her to a narrow victory in Indiana.