The Associated Press is reporting:
Democratic Sen. Edward M. Kennedy of Massachusetts will endorse Senate colleague Barack Obama for president, party officials confirmed Sunday.
The endorsement will be announced Monday in Washington, said the officials, speaking on condition of anonymity because they were not authorized to speak officially.
In a television interview Sunday, Obama would not answer questions about an endorsement from Kennedy.
"I'll let Ted Kennedy speak for himself. And nobody does it better," he said on ABC's "This Week." "But obviously, any of the Democratic candidates would love to have Ted Kennedy's support. And we have certainly actively sought it. And you know, I will let him make his announcement and his decision when he decides it's appropriate."
The New York Times has more:
The Kennedy endorsement has been underway for days, even before the outcome of the South Carolina primary. Mr. Kennedy told his decision to Mr. Obama on Thursday.
"I've had ongoing conversations with Ted since I've got into this race," Mr. Obama told reporters today as he flew to Alabama.
Of all the endorsements in the Democratic Party, Mr. Kennedy's is viewed as the most weighty. He had vowed to stay out of the presidential nominating fight, but as the contest expands into a state-by-state fight - and given the tone of the race in the last week - associates said he was moved to announce his support for Mr. Obama.
The endorsement will be announced at a rally at American University on Monday, hours before the State of the Union Address at the Capitol.
This on top of last night's announcement by Caroline Kennedy, daughter of President John Kennedy, that she is endorsing Senator Obama's bid for the Presidency.
Calling Barack Obama a man who could be "a president like my father," Caroline Kennedy endorsed the Democratic candidate in a very personal opinion piece published in today's New York Times.
"I have never had a president who inspired me the way people tell me that my father inspired them. But for the first time, I believe I have found the man who could be that president - not just for me, but for a new generation of Americans," Kennedy writes.
"Sometimes it takes a while to recognize that someone has a special ability to get us to believe in ourselves, to tie that belief to our highest ideals and imagine that together we can do great things.
"In those rare moments, when such a person comes along, we need to put aside our plans and reach for what we know is possible," she adds.
Other candidates may be experienced or knowledgeable, but this year the country needs a change, Kennedy says - just like it did in 1960 when her father was elected.
Calling her endorsement "patriotic, political and personal," Kennedy applauded Obama for having "built a movement that is changing the face of politics in this country."
The Kennedy name is one of the Democratic party's iconic monnikers, and these two endorsements, timed to coincide with Obama's South Carolina victory, will give Obama another boost.
Update: Here's a link to the New York Times Op-Ed endorsement for Obama written by Caroline Kennedy.
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