Obama wins 2 more superdelegates; Clinton keeps campaigning

The first-term Illinois senator was surrounded in the House by well-wishers calling him "Mr. President" and reaching out to pat him on the back. The glad-handers included a few Republicans, as well as Clinton supporters.

But the 46-year-old was quick to note that he faced a formidable adversary.

"Our goal is going to be to try to be to bring the party together as soon as possible," Obama said after his visit. "But we still have contests remaining, and so in no way am I taking this for granted. We're going to have to keep on working."

"My main message is that whichever way you want to go, the sooner that superdelegates make their decision the sooner we will have a sense of who the nominee will be and sooner we can focus on John McCain," Obama told the Fox News Channel outside his Senate office.

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

While polling in the Pacific Northwest state has been sparse, Obama is believed to hold a significant advantage over Clinton. With DeFazio, he will have the endorsement of three of the state's four Democratic House members.

The Associated Press has contacted nearly 100 of the undeclared superdelegates since the Tuesday contests and has found that many see Obama as the likely nominee, but are reluctant to make a public commitment until after the final states hold their votes June 3.

Obama has focused more intently on Republican John McCain in recent weeks.

On Thursday, he accused McCain in a CNN interview of "losing his bearings" for repeatedly suggesting the Islamic militant group Hamas preferred Obama for president.

That brought an angry response from McCain's campaign, which accused Obama of trying to make an issue of McCain's age. Age is a touchy subject for McCain, who turns 72 in August and would be the oldest person to be sworn in as president if elected.