The Associated Press

Fri, May 9, 2008 (6:13 a.m.)

The movement of Democratic superdelegates to presidential hopeful Barack Obama gained steam Friday, with endorsements expected from two more congressmen.

Obama spokesman Dan Pfeiffer said the Illinois senator plans to receive the endorsement of Rep. Peter DeFazio of Oregon an event Friday in his homestate. Oregon holds it's primary on May 20.

While polling in the Oregon has been sparse, Obama is believed to hold a significant advantage over New York Sen. Hillary Rodham Clinton. With DeFazio, he will have the endorsement of three of the state's four Democratic House members. Reps. Earl Blumenauer and David Wu earlier endorsed Obama, while Gov. Ted Kulongoski and Rep. Darlene Hooley have endorsed Clinton.

In New Jersey, Donald Payne _ a black congressman who had been backing Clinton for the nomination _ is switching his support to Obama, Pfeiffer confirmed.

Clinton won the New Jersey primary on Feb. 5.

"After careful consideration, I have reached the conclusion that Barack Obama can best bring about the change that our country so desperately wants and needs," Payne told The Star-Ledger in Newark, N.J. It was "one of the most difficult decisions I have made," Payne said. "I've really been mulling it over for quite a while."

Obama's endorsements from superdelegates has picked sharply since Tuesday, when he soundly defeated Clinton in North Carolina's primary and held her to a narrow victory in Indiana.

(This version CORRECTS UPDATES throughout with additional background, corrects day to 'Friday' sted 'Thursday.')