The endorsement will be announced today in Washington, said the officials, speaking on condition of anonymity because they were not authorized to speak for the record. An official close to the senator said the announcement will be made during an Obama campaign rally at American University, where he will be joined by Kennedy and his niece, Caroline Kennedy, who also has endorsed Obama.

• Former first daughter Chelsea Clinton — scheduled to appear Tuesday in Utah — stumped on behalf of her mother's presidential campaign Sunday in Jonesboro, Ark.

"We need to get control of our economy," Clinton, 26, told a crowd of nearly 250 at Arkansas State University. "My mother is in favor of the stimulus, and we need to get hold of the home crisis."

Clinton said she does not want to follow in her parents' footsteps and does not know whom her mother would select as a running mate if she wins the Democratic nomination.

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Contributing: Charles Babington, Associated Press

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