With Sen. Edward M. Kennedy's endorsement of Barack Obama, the list of star-aligning endorsements shrinks to about two: former Sen. John Edwards, if he decides to drop out, and, of course, former Vice President Al Gore.

At this point, he has not told any of his political advisers and friends if he is considering an endorsement. During the past year, he has spoken privately with all three leading Democrats.

An adviser said that Mr. Gore had long ago decided to lay low once the Democratic delegate selection contests began so as not to interfere in the race.

Last night, a close adviser said "nothing has changed" with regard to Mr. Gore's decision to keep mum about an endorsement.

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